Most krill oil is somewhere between 30 and 50 percent phospholipid by weight, and the percentage matters less than the sellers say and more than the skeptics say. It’s the one number on a krill label that tells you whether you’re holding krill oil at all.

We sell Captains Krill Oil™, so we have a horse in this race. Here’s the honest version anyway: what the number means, what the human trials actually show when you raise it, and why the best use of it is as a fraud check rather than a bragging right.

One housekeeping note. This is about the phospholipid number on a krill oil label. If your question is the bigger one — phospholipid omega-3 versus the triglyceride form in fish oil, and whether the form is worth paying for — we’ve answered that separately. This page is for the person holding two bottles and wondering why one says 40% and the other says 56%.

What “phospholipids” means on a krill oil label

Krill oil is a mix of two kinds of fat. Part of it is ordinary triglyceride — the same storage fat that makes up fish oil. The rest is phospholipid: two fatty-acid tails on a glycerol backbone, plus a phosphate head that makes the molecule water-friendly on one end. It’s the architecture of your own cell membranes. In krill, most of that phospholipid is phosphatidylcholine, and a large share of the krill’s EPA and DHA is bound to it rather than to the triglyceride fraction.

So when a label says “phospholipids 400 mg” per 1,000 mg of oil, it is telling you 40% of the oil is the membrane-type fat and 60% is the storage type. That ratio is what the whole “krill versus fish oil” argument rests on. It’s also the ratio that shifts with how the oil was made.

The actual numbers

The reference standard is the krill oil monograph in the Food Chemicals Codex, the US Pharmacopeia’s book of food-ingredient specs. Its range for total phospholipids is 28 to 52 percent by weight, with phosphatidylcholine making up 60 to 90 percent of that phospholipid. ConsumerLab uses the same range when it tests krill products, measured by phosphorus-31 NMR. Anything inside that band is, by the codex’s definition, krill oil.

Where individual products land:

• Aker BioMarine’s Superba 2, the ingredient behind a large share of the brands on the shelf, runs about 40% phospholipids.
• Superba Boost, the same company’s premium grade, is concentrated after extraction to 56% or more. That’s the “56% phospholipids” you see in Amazon titles.
• Captains: a typical two-softgel serving of 1,000 mg of oil carries about 411 mg of phospholipids — roughly 41%. That’s a recent typical figure, not a locked spec. Ours is a pressed, unconcentrated oil, and a natural catch moves around a little lot to lot. We test lots at random and they come back strong; we’d rather tell you that than print a number we’d have to engineer the oil to hit.

The variance isn’t a manufacturing failure — it’s biology. Krill phospholipid content shifts with season, sex, maturity and where the swarm was feeding; published values for the raw animal range from under 40% in gravid females up to 80% in lab-fractionated oils. An oil that reads exactly the same number every time has been standardized in a plant. An oil that reads 39% one lot and 43% the next came out of a krill.

Does a higher percentage put more omega-3 in your blood?

This is the question the 56% products are selling on, so it deserves a straight answer. There are three trials worth knowing, and they don’t all point the same way.

The one that supports it. In 2015, a Canadian group ran a 20-person crossover trial comparing a high-phospholipid krill oil to a low-phospholipid one. Both delivered 600 mg of omega-3 a day. After four weeks, plasma EPA and DHA rose by the same amount on both — no difference. Red-blood-cell EPA+DHA, a slower and arguably better marker, rose more on the high-phospholipid oil. Three things to read alongside that: the high-phospholipid group swallowed twice as much oil (3 g versus 1.5 g) to get its 1,200 mg of phospholipid; the study was funded by Enzymotec, a company that sold krill oil; and twenty people is twenty people.

The one that doesn’t. Also in 2015, DSM — a fish oil company — put 66 adults on 1.3 g a day of EPA+DHA as fish-oil triglyceride, fish-oil ethyl ester, or krill oil, matched to the milligram. After four weeks, plasma EPA+DHA was the same across all three. Matched for omega-3 dose, the phospholipid form bought nothing in that trial.

The newest one. In May 2026, a University of Sherbrooke team funded by the Canadian Institutes of Health Research published a 72-person, 12-week randomized trial in the American Journal of Clinical Nutrition. Both groups got about 1.1 g a day of omega-3; the krill group (on Superba Boost, the 56% grade) showed roughly 1.5 times the rise in plasma EPA and DHA that the fish oil group did. The authors were careful in a way sellers won’t be: they said the difference is “probably not related to higher absorption” and more likely to how the body handles phospholipid-bound fat after absorption, and that higher plasma levels “do not necessarily translate into superior clinical outcomes.”

Put together: over months, the phospholipid form does seem to raise blood omega-3 more than fish oil at the same dose, and that finding got stronger this year. Whether 56% beats 40% within krill oil rests on one small industry-funded trial where the high group also took double the oil. Nobody has shown that either number changes how your knees feel or what your cardiologist sees. Choosing between two krill oils on the percentage alone is choosing on the thinnest evidence in the category.

Why the number matters anyway: it’s the authenticity check

Here’s the use of the phospholipid line that nobody advertises. Krill oil costs several times what fish oil does, and where there’s a price gap there’s dilution. Cut it with cheap fish oil, or with soy lecithin to keep the phospholipid reading up, and most buyers can’t tell.

Chemists can. A 2018 paper from Deakin University worked through the detection methods: in genuine krill oil the EPA and DHA sit mostly on the phospholipids, so a “krill oil” with a lot of omega-3 on its triglycerides has been topped up with fish oil. Carbon-13 NMR caught anchovy oil at 10% or more; thin-layer chromatography caught fish-oil ethyl esters at 1%; and phosphorus-31 NMR — the same method the codex uses for the phospholipid figure — flags cheap phospholipid sources like soy. ConsumerLab’s krill testing over the years has found products that didn’t contain their expected phospholipids or astaxanthin.

So read the label this way. A phospholipid figure inside 28–52% (or above it with an honest “concentrated” explanation) is consistent with krill oil. A krill oil label with no phospholipid line at all is telling you the maker either didn’t measure the one thing that makes krill oil krill oil, or didn’t want you to see it. Either way, ask.

Reading the label without getting played

Divide, don’t admire. “500 mg phospholipids” from a 1,000 mg serving is 50%; from a 1,500 mg serving it’s 33%. The big number on the front is usually the oil mass, and “triple strength” tells you about the capsule, not the omega-3.

Above the mid-50s means a factory step. Krill don’t make a 56% oil; a plant does, by pulling the triglyceride fraction back out after extraction. That isn’t sinister — it’s real processing — but it’s the opposite of “straight from the animal,” and the evidence that it helps you is the 20-person study above.

Watch the astaxanthin line too. The red pigment travels with the phospholipid; a healthy phospholipid number next to almost no astaxanthin means the oil has been through something.

How Captains lands where it lands

Our oil is pressed mechanically on the boat from fresh-caught krill — no solvents at any stage, no concentration step afterward. Around 41% phospholipid is simply where an unconcentrated pressed oil comes out, which is why it sits right in the middle of the codex range rather than above it. We’ve made it the same way for twenty years. You’ll notice it’s not the biggest number on the shelf, and we’re not going to dress it up.

You might not need us

If you eat fatty fish twice a week, skip the capsule and this whole debate. If you want the most EPA and DHA per dollar, a good triglyceride fish oil wins on price and the matched-dose evidence says you’re not losing much. If a high phospholipid number is what you want, buy a Superba Boost–based product — that’s the honest recommendation, and it isn’t us. Captains is for the person who wants a raw, unconcentrated oil from a boat and is willing to accept a number that moves a little because nobody engineered it.

Honest answer, not a pitch. — captainskrilloil.com

Frequently asked questions

What percentage of phospholipids should krill oil have?

The Food Chemicals Codex monograph puts genuine krill oil at 28–52% total phospholipids by weight, with phosphatidylcholine making up 60–90% of that. Standard ingredients like Superba 2 run about 40%; concentrated grades like Superba Boost run 56% or more. Anything in or above that band is consistent with real krill oil.

Is 56% phospholipid krill oil better than 40%?

It contains more phospholipid per capsule, which is what it says. Whether that does more for you rests on one 20-person, industry-funded trial in which the high-phospholipid group also took twice the oil and showed higher red-cell omega-3 but identical plasma levels. No trial has tied the percentage to a health outcome.

How many mg of phospholipids are in Captains Krill Oil?

A typical two-softgel serving of 1,000 mg of oil carries about 411 mg of phospholipids, roughly 41%. That’s a recent typical figure for a pressed, unconcentrated natural oil, not a locked spec — it moves a little lot to lot, and we test lots at random rather than engineering the oil to hit a number.

Can a krill oil be faked or diluted, and how would I know?

Yes. Krill oil can be cut with cheaper fish oil or soy lecithin, and chemists detect it with NMR and chromatography by looking at where the EPA and DHA sit and what kind of phospholipid is present. As a buyer, the practical check is whether the label states a phospholipid figure inside the codex range at all; a krill oil with no phospholipid line is a reason to ask questions.

Why does the phospholipid content of krill oil vary?

Because krill are animals. Their lipid makeup shifts with season, sex, maturity and feeding grounds, so an unconcentrated oil naturally reads a few points differently from one lot to the next. An oil that reads identically every time has been standardized in a plant; that’s a processing choice, not a sign of higher quality.

Mostly, no — not the way the marketing implies. The transporter story krill sellers lean on is real science, but the best evidence says ordinary krill oil does little to raise brain DHA, and no trial anywhere has shown that a krill oil capsule improves memory.

We sell krill oil — Captains Krill Oil™ — so it would be easier for us to repeat the claim. It’s a good story: the brain’s gate, the special key, our oil happens to be the key. But we’ve read the studies the story is built on, and they say something more interesting and less flattering. Here it is, straight.

Where the blood-brain-barrier story comes from

Your brain is the fattiest organ you own, and DHA — the long omega-3 — is its favorite building fat. But the brain doesn’t take deliveries from just anyone. In 2014, researchers identified a transporter called Mfsd2a sitting at the blood-brain barrier, and found it ferries DHA into the brain in one specific package: lysophosphatidylcholine, or LPC-DHA. Not free DHA. Not the triglyceride form in standard fish oil. A phospholipid-type carrier.

You can see the marketing leap from the deck of the boat. Krill oil carries its omega-3s on phospholipids — that’s the honest, real difference between krill and fish oil, and we’ve written about what the phospholipid form does and doesn’t mean. So the pitch writes itself: brain wants phospholipids, krill has phospholipids, buy krill for your brain.

The pitch skips a step. The step is digestion.

The step the marketing skips

The DHA in krill oil rides on phosphatidylcholine — PC, not LPC. Those are different molecules, and your gut doesn’t hand either one to your bloodstream intact. Digestion breaks most dietary fat apart and repackages it, and by the time krill oil’s omega-3s are circulating, most of them are traveling in the same vehicles fish oil’s are. The special key mostly doesn’t survive the trip to the door.

Don’t take our word for it — take the word of the research program that krill marketing borrows its credibility from. In a 2017 study in Scientific Reports, mice fed DHA in the LPC form built measurably more brain DHA and did better on memory tasks; the same DHA in ordinary form did neither. Then in 2020, the same group tested krill oil itself. Krill oil pre-treated with an enzyme to convert its PC into LPC raised brain DHA about 5-fold and brain EPA about 70-fold in mice. Untreated krill oil — the thing actually inside every capsule on the shelf, ours included — had little effect on either.

Read that closely. The study most often waved in the direction of “krill oil crosses the blood-brain barrier” is, on its own data, a demonstration that regular krill oil is not the shortcut. The shortcut is a modified research oil that you cannot buy.

What the human trials actually show

Mice aren’t people, so here’s the human ledger, and it’s short.

One randomized controlled trial has looked at krill oil and brain function in healthy people: Konagai and colleagues, 2013 — 45 healthy Japanese men, aged 61 to 72, twelve weeks of krill oil, sardine oil, or a placebo oil. The krill group showed greater changes in blood-oxygen signals over the cortex during memory and calculation tasks, and a shorter P300 brain-wave latency during a working-memory task. Those are real measurements. They are also not the thing you care about: the study didn’t show people remembering more, thinking faster, or performing better on anything. Forty-five men, one trial, brain signals but not outcomes.

The Alzheimer’s Drug Discovery Foundation, which reviews the evidence on brain supplements for a living, puts it flatly: no studies have tested whether krill oil can prevent cognitive decline or dementia, and per capsule, krill oil carries considerably less DHA and EPA than fish oil to begin with.

And then there’s the trial the industry doesn’t mention. In 2009, Neptune — then the biggest name in krill oil — registered a 175-patient, three-arm, placebo-controlled trial of its krill oil in early-stage Alzheimer’s disease, called MNEMOSYNE. It ran, it finished in 2011 — and as far as we can find, the results were never published anywhere. A krill company ran the largest brain study in the category’s history and went quiet. We can’t tell you what the data said. We can tell you that companies rarely sit on good news for fifteen years.

Your brain wants a trickle, not a flood

Here’s the context that makes the whole argument smaller than the ads want it to be. PET-imaging work at the NIH measured how much DHA the living adult human brain actually consumes: about 3.8 milligrams a day, with a half-life of roughly two and a half years. Your brain is not a bucket you top up each morning. It’s a slow-turnover organ that holds its DHA for years and sips replacement in milligrams.

What that means practically: a couple of servings of fatty fish a week supplies the brain’s trickle many times over, and the question that matters is whether your diet contains meaningful EPA and DHA at all over years — not which capsule tells the cleverest transporter story this month.

What we’ll say about our oil — and what we won’t

The honest version of the Captains pitch has never needed the brain claim. We press the oil mechanically, on the boat, right after the catch — no chemistry, no solvents at any stage. What’s in the capsule is the whole natural oil the krill were carrying: phospholipids, EPA, DHA, astaxanthin, in proportions that vary a little lot to lot the way a wild catch does. We test lots at random and they come back strong, documentation available on request, and we’ve been at this for 20 years.

What we won’t do is tell you that capsule crosses the blood-brain barrier and sharpens your memory. On the evidence, nobody’s krill oil has earned that sentence — including ours. A brand that says it anyway is quoting mouse studies about an enzyme-modified oil it does not sell.

You might not need us

If you eat fatty fish twice a week, your omega-3 needs — brain included — are likely covered, and no capsule earns its price. If brain health is the only reason you’re shopping for krill oil, our honest advice is to save the money or spend it at the fish counter, because the brain-specific evidence for any krill capsule is one small trial of brain signals. If you’re vegetarian, or you simply want DHA at the lowest cost per milligram, algae oil or fish oil will serve you better than we will, and we’ve said so in print before.

Buy Captains for what it verifiably is — a raw, mechanically pressed, whole krill oil from a boat, not a factory. Not for a brain shortcut the science hasn’t delivered to anyone yet.

Honest answer, not a pitch. — captainskrilloil.com

Frequently asked questions

Is krill oil good for memory?

Unproven. One 12-week randomized trial in 45 healthy older men found changes in brain-activity signals during memory tasks, but no improvement in actual task performance was reported, and no trial has tested whether krill oil slows cognitive decline. That’s the entire human evidence base for “krill oil and memory.”

Is krill oil better than fish oil for your brain?

No head-to-head trial with brain outcomes has answered that, and per capsule, krill oil carries considerably less DHA and EPA than fish oil. The phospholipid difference between them is real in the bottle, but after digestion the omega-3s from both travel in largely similar forms. For brain purposes, the honest answer is: buy whichever you’ll take consistently, or eat the fish.

What is LPC-DHA, and does krill oil contain it?

LPC-DHA — lysophosphatidylcholine-bound DHA — is the specific package the brain’s Mfsd2a transporter carries across the blood-brain barrier. Krill oil’s DHA is mostly bound to regular phosphatidylcholine, not LPC. The studies showing large brain-DHA increases used krill oil modified with an enzyme in a lab to create LPC forms; that research oil is not what’s sold in stores.

Does the astaxanthin in krill oil protect the brain?

Astaxanthin is a genuine antioxidant, but the amount in a daily krill oil serving is a fraction of the doses used in the studies behind those claims. Its proven job is protecting the oil in the bottle from oxidizing — we cover that honestly in our astaxanthin article.

How much DHA does the brain actually use per day?

NIH imaging work in living adults put whole-brain DHA consumption at roughly 3.8 mg per day, with a half-life of about two and a half years. Brain DHA is built by diet over years, not by any given week’s capsules — which is why fish-eating habits matter more than supplement brand choices.

Here is the answer nobody selling krill oil wants to give you: there is no independently verified “best” krill oil, because no head-to-head trial of consumer krill oil brands has ever been run, and most of the guides ranking them are written by people selling one. We sell one too — Captains Krill Oil™ — so read this the way you’d read anything from inside an industry: for the facts you can check, not the ranking.

What we can give you is better than a ranking. It’s the short list of things that actually differ between bottles, and the longer list of things that don’t.

Start here: most krill oil brands don’t catch anything

The krill oil aisle looks like dozens of companies. The ocean tells a different story. One Norwegian operation — Aker QRILL Company — took roughly 63% of the entire world Antarctic krill catch in 2024 and 52% in 2025. A handful of other fleets from Norway, China, and South Korea take most of the rest. Nearly every bottle on the shelf traces back to that small fleet, fishing the same species in the same regulated waters.

Most brands buy their oil from an ingredient supplier, put a label on it, and compete on the label. That’s why two competing bottles can contain oil that came off the same ship in the same season — a point we laid out in what “Antarctic” on a krill oil label actually means. When you ask “which brand is best,” you’re often comparing marketing departments, not oils.

The names on the back panel: Superba and Rimfrost

If a krill oil label names its oil source, it will usually be one of two ingredient brands, and knowing them tells you more than the front of the box does.

Superba™ is Aker’s ingredient line. The standard oil runs around the typical phospholipid range for krill; the concentrated version, Superba Boost™, is processed to above 56% phospholipids against roughly 40% in typical krill oil, using their Flexitech process. That is factory concentration in the literal sense — done well, by the biggest player in the fishery.

Rimfrost™ grew out of the Norwegian harvester Olympic Seafood, runs its own vessel, and consolidated the business under the Rimfrost name in 2025. Their pitch is speed: krill processed on board immediately after the catch, before the clock we describe below runs out.

Here’s the honest read on both: they are competent suppliers, and a brand that names its supplier is telling you something real. A brand that names nothing is asking you to trust a label. If you’re comparing two bottles and one says whose oil is inside, that one has already answered a question the other one is dodging.

The four things that actually differ between bottles

1. Phospholipid share — and it’s a twofold spread. A comprehensive review of commercial Antarctic krill oils found phospholipid content ranging from about 39% to 81%. Phospholipids are the delivery form people buy krill oil for. Two bottles that both say “krill oil 1000mg” can differ by a factor of two in the very thing that makes krill oil krill oil — and neither front label will tell you.

2. The clock between the net and the press. Krill carry aggressive digestive enzymes that start breaking the catch down within the hour — the patent literature on krill processing targets getting krill into processing within about 60 minutes of decking, preferably 15. Oil made from krill meal that sat, shipped, and waited is chemically different from oil made on the water. This is why where the processing happens matters more than which ocean the label mentions.

3. How the oil got out of the krill. Most krill oil is pulled out of dried krill meal using chemistry — ethanol or acetone processing is the industry norm, followed by steps to remove the residues. The alternative is mechanical: press the oil out of the fresh catch and stop. We describe our version of that in Boat to Bottle. Neither route is a scandal; they produce different oils, and almost no label tells you which one you’re holding.

4. Freshness when it reaches you. Omega-3s oxidize. A well-made oil that spent eighteen months in a hot warehouse is a poorly made oil by the time you swallow it. No ranking article can measure this for the bottle you’ll actually receive — which is one honest reason the “best brand” question has no stable answer.

Notice what’s not on the list: the milligram number on the front, the word “Antarctic,” the word “pure,” and the star rating. Those are the things the aisle competes on.

About those “best krill oil” rankings

Search the question and you’ll find list articles ranking ten brands. Read the fine print: several are published by supplement sellers, and each ranks its own bottle first. Most of the rest carry affiliate links that pay the author when you click their pick. We’re not saying the writers are lying. We’re saying nobody in those results — including us — is a neutral party, and a ranking with a commission behind it is an ad wearing a lab coat.

Where Captains sits in all this, honestly

Captains is a small-batch oil pressed mechanically from the fresh catch, right on the boat, with no chemicals at any stage. We’ve been doing it for 20 years. Because it’s a natural raw oil, it varies a little lot to lot the way a wild catch does; we test lots at random and they come back strong, and documentation is available on request.

And the unflattering part, since this is a buyer’s guide: Captains is expensive. Independent cost comparisons put krill oil at roughly $1.38 to $2.60 per 500 mg of EPA+DHA against 16 to 56 cents for fish oil — and we sit at the top of the krill range. We explained the reasons in Why Is Krill Oil So Expensive?, but the reasons don’t make it cheap.

You might not need us

If you want the most EPA and DHA per dollar, the honest answer is a concentrated fish oil, not any krill oil — ours included. If what convinced you was Superba Boost’s concentration or Rimfrost’s onboard processing, buy a bottle that names that supplier; you don’t need our label for their oil. And if you eat fatty fish twice a week, you don’t need a capsule at all. “Best” is the supplement you actually needed, at a price you’ll keep paying, fresh when it arrives. For some readers that’s ours. For plenty it isn’t.

Honest answer, not a pitch. — captainskrilloil.com

Frequently asked questions

Is Superba krill oil better than regular krill oil?

Superba™ is an ingredient brand from Aker, the fishery’s largest operator, not a magic tier. Its Boost version is concentrated above 56% phospholipids versus roughly 40% typical, which is a real difference if phospholipid content is what you’re buying for. “Better” depends on whether you want a concentrated factory oil or a whole pressed one.

What’s the difference between Superba and Rimfrost?

Superba™ comes from Aker QRILL, which took over half the world krill catch in each of the last two seasons; Rimfrost™ grew out of Olympic Seafood and processes its catch on board its own vessel. Both are Norwegian-rooted, both fish the same regulated Antarctic waters, and both supply many consumer brands. The bigger difference is usually the brand’s handling and honesty downstream of either supplier.

Does a higher milligram number mean better krill oil?

No. The front-of-box number is the weight of oil in the capsule, not the omega-3 in it, and commercial krill oils vary about twofold in phospholipid share. Two “1000mg” bottles can be very different oils. Read the back panel, not the front.

Is the most expensive krill oil the best?

Not automatically — and we say that as the most expensive softgel in the search results. Price tracks harvesting and handling costs, but it can also just track marketing. Check what the price is buying: named sourcing, processing method, freshness. If a label can’t tell you, the price is decoration.

How do I find out which supplier a brand uses?

Look for Superba™, Rimfrost™, or a named fishery on the label or the brand’s site; MSC certification numbers can also trace to the fishery. If a brand won’t say where its oil comes from, that silence is information too. We’re the catch and the bottler, which is the other way to answer the question.

Short answer: if you’re vegetarian or vegan, buy algae oil. It is the only source of marine-grade EPA and DHA that involves no animal at all, and we say that as a company that sells krill. For everyone else, the choice comes down to what’s actually in each oil, what a milligram of omega-3 costs from each, and one fact about the food chain that the krill industry — us included — doesn’t usually lead with. Here it is first.

Every omega-3 in a krill started out in an alga

Krill don’t make EPA and DHA. Nothing in the animal kingdom makes much of it. The molecules are built by microalgae at the bottom of the marine food chain, and everything above — krill, sardines, salmon, whales — gets its omega-3 by eating them, directly or several stomachs removed. Even the astaxanthin that makes krill oil deep red comes from the krill’s algal diet.

So the honest way to describe algae oil is this: it skips the middleman. Instead of waiting for a crustacean to concentrate the algae’s oil for you, you grow the algae and press the oil out of them directly. That is the single strongest argument for algae oil, and you’ll notice it’s a krill company telling you.

What algae oil actually is — a factory product, and for once that’s the point

Commercial algae oil mostly comes from Schizochytrium, a marine microorganism grown nowhere near the sea. It’s raised in closed stainless-steel fermenters, fed sugar in the dark — the commercial strains don’t even photosynthesize — then harvested and pressed. The UK’s food-safety regulator has assessed several of these strains as novel foods, which is how tightly defined the process is: named strain, defined feedstock, specified oil.

We spend a lot of time on this site saying “from a boat, not a factory.” Algae oil is from a factory in the most literal sense — and in this one comparison, that cuts in its favor. A closed tank has no fishery, no bycatch, no season, and no ocean-borne contaminants to worry about. It doesn’t touch the ocean at all.

The composition difference nobody puts on the front of the box

The two oils are not interchangeable milligram for milligram, and the difference isn’t the total — it’s the split.

Most algal oils are DHA-heavy. Some are DHA-only; the classic Schizochytrium strains produce mostly DHA, and strains with meaningful EPA are a newer development. Krill oil runs the other way: it’s EPA-forward, typically carrying substantially more EPA than DHA, and it arrives packaged in phospholipid form with its astaxanthin still aboard. Algal oil is a triglyceride oil, like ordinary fish oil.

The practical advice is the same one we give in every comparison we’ve written: turn the bottle over. Ignore the front-of-box number and read the EPA and DHA lines per softgel. Some algal products have an EPA line that reads zero. If you’re following research that leaned on EPA, that matters.

What the trials actually show for algae oil

The evidence for algal oil is real, and we’re not going to pretend otherwise.

The bioavailability question was settled back in 2008: Arterburn and colleagues randomized 32 adults to 600 mg of DHA a day from either algal-oil capsules or portions of cooked salmon for two weeks. Plasma phospholipid DHA rose about 80% in both groups. The capsules were nutritionally equivalent to eating the fish — for the nutrient measured. That’s about as clean a result as supplement science produces.

On blood lipids, a 2012 meta-analysis in the Journal of Nutrition pooled 11 randomized trials — 485 people, median dose 1.68 g of algal DHA a day — and found triglycerides down about 18 mg/dL, HDL up modestly, and LDL up about 9 mg/dL. If that LDL number sounds familiar, it’s the same caveat we published about krill and fish oil in our cholesterol article: omega-3s can pull triglycerides down and nudge LDL up at the same time. Algae oil doesn’t escape that; it’s the molecules, not the source.

Note the dose, though: 1.68 g a day is several softgels of any consumer product, algal or krill. The headline effects in the trials come from bigger doses than most labels suggest.

And the comparison you actually came here for — krill against algae, head to head, in a randomized trial? We looked. We could not find one. Both oils have been compared against fish oil in separate studies, and anyone who tells you one “absorbs better” than the other is extrapolating across trials that were never designed to meet. That includes us: the phospholipid form is a real absorption advantage on the evidence we have, and it is modest, not a multiplier.

What a milligram costs from each

ConsumerLab, which tests and prices these products independently, puts the cost of 500 mg of EPA+DHA at roughly 16–56¢ from fish oil, 48–61¢ from algal oil, and $1.38–$2.60 from krill oil. Krill — ours included — is the most expensive way to buy a milligram of omega-3. Algal sits in the middle. Fish is cheapest. We’ve published that before and it hasn’t stopped being true.

Sustainability: algae doesn’t just compete here — it wins

The Antarctic krill fishery is genuinely well managed — catch limits set by treaty, and in 2025 the fleet hit its trigger level for the first time and the fishery closed early, which is the system working, as we’ve written. But a well-regulated fishery is still a fishery. A fermentation tank has no catch limit because it has no catch. If your first filter is “no animal, no ocean impact,” this comparison is over before it starts, and algae oil is the answer.

A note on Captains

Captains Krill Oil™ is a whole, natural oil, pressed mechanically from fresh-caught Antarctic krill right on the boat — no chemicals at any stage, no shipping krill meal across the world to be reprocessed months later. It’s a natural catch that varies a little lot to lot; we test lots at random and they come back strong, and documentation is available on request. We’ve been doing it this way for 20 years.

But notice what none of that answers: the vegan question. If the reason you’re reading this is that you don’t eat animals, our process doesn’t matter — the krill does. No sourcing story changes what a krill is.

You might not need us

Three honest exits. If you’re vegetarian or vegan, buy algae oil — it’s the only option on this page that fits, and the DHA evidence behind it is solid. If you eat fatty fish twice a week, you likely don’t need either capsule; the salmon in the Arterburn trial performed exactly as well as the supplement it was tested against. And if you’re chasing grams of omega-3 for a triglyceride number, concentrated fish oil is the cheapest route per milligram — and at those doses it should be a conversation with your doctor, not a shelf decision.

If you eat fish, want an EPA-forward whole oil, and care how the thing was made, that’s the buyer we built Captains for.

Honest answer, not a pitch. — captainskrilloil.com

Quick answers

Is algae oil as good as krill oil?

For DHA, algal capsules proved nutritionally equivalent to cooked salmon in a randomized trial, which is a strong result. But the two oils differ in composition: algal oil is DHA-heavy and often low or zero in EPA, while krill oil is EPA-forward with phospholipids and astaxanthin. No head-to-head trial has compared them directly.

Does algae oil contain EPA?

It depends on the product. Classic Schizochytrium algal oils are mostly DHA, and some products contain no meaningful EPA at all; newer strains include both. Check the EPA line on the supplement facts panel rather than the front of the box.

Is krill oil vegan?

No. Krill are animals — small crustaceans — so no krill oil is vegan or vegetarian. Algae oil is the vegan source of marine EPA and DHA, made from microalgae grown in fermentation tanks.

Which is more sustainable, krill oil or algae oil?

Algae oil. It’s grown in closed fermenters on land with no fishery involved. The Antarctic krill fishery is tightly capped and regulated by treaty, and closed early in 2025 when it hit its trigger level — but a tank with no catch beats even a well-managed catch on ocean impact.

Can you take krill oil and algae oil together?

You can, but there’s rarely a reason to. Both deliver EPA and DHA, and your total intake is what matters. Pick one based on your diet, the EPA/DHA split you want, and what you’re willing to pay per milligram.

Here’s a test almost nobody runs on a supplement they swallow every day: take one of your krill oil softgels, cut it open, and smell it.

What your nose is telling you

Fresh krill oil smells like the ocean — briny, clean, faintly like shellfish. Rancid oil smells sharp, fishy, almost like paint or old varnish. Your nose knows the difference, because that smell is the oil telling you it’s oxidized.

Three more signs

1. The fishy burp. Fresh oil repeats less; oxidized oil announces itself.
2. Color. Krill oil should be a deep red from natural astaxanthin — pale or brownish oil has been through something.
3. Heat. If your softgels spent a summer in a hot mailbox or a warehouse, the clock ran faster.

Why so much oil arrives tired

Distance and time. Krill harvested, shipped, processed later, extracted with solvents or CO₂, stored in drums, encapsulated eventually. Ours skips the waiting: mechanical extraction right on the boat, small batches into softgels while it’s fresh. The smell test is one we’re happy for you to run.

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Honest answer, not a pitch. — captainskrilloil.com

Video visuals are AI-generated illustrations of our process. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.