Every lot of Captains Krill Oil is tested before it ships. Look yours up. The lot number is printed on the bottom of the bottle and on the box flap, next to the best-by date. Not a customer yet? Look at the latest lot and judge us by the number.
Lot 56189 Certificate of analysis dated April 10, 2025
Why this one is boxed: peroxide value is the one figure on a certificate that measures the condition of the oil — how much it has already oxidized — rather than how much of something is in it. Lower is fresher. This lot measured less than a twenty-fifth of the allowed maximum, by AOAC method 965.33. It is the number to ask any omega-3 brand for, and the one most cannot produce.
- EPA
- 153 mg
- DHA
- 97 mg
- Total omega-3
- 305 mg
- Phospholipids
- 411 mg
- Astaxanthin
- 1.53 mg
Per serving, from our manufacturer’s certificate of analysis. This lot was also tested against specification limits for microbial counts, heavy metals, PCBs, dioxins and pesticide residues. Softgels made in an NSF-registered GMP facility under 21 CFR 111.
Want to try it against the bottle you have now? Get the 2-pack on Amazon with Prime shipping — the better price per softgel, at your door in a couple of days.
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What peroxide value is, and why it is the number to ask for
Almost everything on an omega-3 label is a quantity: milligrams of EPA, milligrams of DHA, milligrams of krill oil. None of it tells you the thing that decides whether a capsule works or repeats on you all afternoon, which is how much the oil had already gone rancid before you swallowed it. That has a measurement. It is called peroxide value, it is reported in milliequivalents per kilogram (mEq/kg), and it is tested lot by lot. Lower is fresher.
Milligrams of EPA and DHA tell you what went into the capsule when the oil was pressed. Peroxide value tells you what is in it now — the part you actually swallow, and the part responsible for the fishy repeat that makes people quit omega-3 supplements altogether.
So here is the useful thing to do with this page: ask any omega-3 brand for their peroxide value and the limit it was measured against. Most cannot produce either number. A few will send a certificate with the freshness line missing. That comparison is the entire reason this page exists.
Why the number comes out this low
Krill oxidizes fast — it begins breaking down within minutes of coming out of the water, which is why most krill oil is frozen, shipped, thawed and processed onshore weeks later. Ours is cold-pressed on the boat, without solvents, in small lots, by a small family operation. That costs more to do and we have not found a way to make it cheaper. The peroxide number above is what you are paying the difference for. If you want the full arithmetic, including the parts that do not flatter us: Why Is Krill Oil So Expensive? The Honest Breakdown.
Try it against your current bottle
Cut one of your current softgels open and smell it, then do the same with one of ours. Fresh krill oil smells briny and clean, like the ocean. Oxidized oil smells sharp, fishy, or faintly like old paint. You do not need a laboratory to tell the difference, and once you have smelled both you will not go back to guessing. The 2-pack on Amazon ships with Prime.
Why we publish the numbers but not the laboratory’s name
Laboratories and contract manufacturers charge a separate licensing fee to have their name and certifications used in marketing, and being named shifts liability onto them. We do not pay that fee, so we do not use the name. What we publish instead is the part that is worth something to you: the measured values, the specification limits and the test methods. A name proves nothing. A number measured against a stated limit by a stated method is checkable.
If your lot is not listed yet
Reply to your order confirmation email with the lot number from your bottle and we will publish that lot’s results here. New certificates are added as each shipment arrives.