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Supplements aren’t medicine, and this isn’t medical advice. Omega-3 products can interact with medications — blood thinners in particular — so clear any new supplement with your doctor or pharmacist first.
For most people comparing fish oil vs krill oil vs algal oil, plain fish oil in triglyceride form is the answer: it delivers the most EPA and DHA per dollar by a wide margin. Algal oil is the pick if you’re vegan or want a DHA-forward option with the cleanest sustainability story, and krill oil — despite a real absorption advantage — is hard to justify once you price it per gram of omega-3 actually delivered. The interesting part is how big the gaps are, so let’s put numbers on them.
What’s actually inside each softgel?
All three exist to deliver the same two fatty acids, EPA and DHA — but the concentration varies enormously by source. Krill oil carries roughly 240–300 mg of EPA and 110–150 mg of DHA per gram of oil, per Mito Health’s omega-3 supplement guide. Algal oil is DHA-dominant, typically 200–400 mg of DHA in a 500 mg capsule, with modest EPA. Fish oil spans the widest range: budget ethyl-ester concentrates to premium triglyceride-form oils, with the form mattering more than the label art — the same guide puts ethyl-ester absorption 20–30% below triglyceride-form oils.
Krill’s calling cards are its phospholipid structure and naturally occurring astaxanthin, an antioxidant that helps keep the oil from oxidizing. The phospholipid form is genuinely better absorbed — a 2011 study in Lipids by Ulven and colleagues is the one usually cited, and Mito Health summarizes the advantage at roughly 68% better uptake than standard fish oil. The catch comes next.
The cost of the same dose, computed
A common maintenance target is 1,000 mg of combined EPA+DHA per day. Using Mito Health’s reported cost bands per 1,000 mg of EPA+DHA — fish oil $0.10–$0.20, algal oil $0.30–$0.50, krill oil $0.40–$0.60 — we computed what a year at that dose costs from each source. The annualization is our arithmetic.
| Cost per 1,000 mg EPA+DHA | Cost per year at 1,000 mg/day (our math) | Capsule reality | |
|---|---|---|---|
| Fish oil (triglyceride form) | $0.10–$0.20 | ~$37–$73 | 1–2 concentrated softgels |
| Algal oil | $0.30–$0.50 | ~$110–$183 | 2–4 capsules, DHA-heavy |
| Krill oil | $0.40–$0.60 | ~$146–$219 | 3+ softgels — each gram carries only ~350–450 mg EPA+DHA |
This table is the whole argument. Even if you credit krill oil’s superior absorption in full, it costs three to four times more per delivered gram — you could simply take a modestly higher fish-oil dose and bank the difference. Krill’s absorption edge is real chemistry; it just doesn’t survive the price gap.
Which one fits which buyer?
Fish oil suits most people, with two checkboxes: triglyceride (TG) form on the label, and third-party purity testing. Sustainability varies by fishery, so an MSC certification is worth looking for, per Mito Health’s guide.
Algal oil is the only vegan source of preformed DHA and EPA here, grown in tanks with no ocean impact — the strongest sustainability profile of the three. It’s the default for vegetarians, and a reasonable pick for anyone prioritizing DHA specifically.
Krill oil makes sense mainly for people who experience fishy burps with regular fish oil (the phospholipid form is gentler for many) and don’t mind paying for that comfort. Note the sourcing debate: krill are a keystone species in the Antarctic food web, and Mito Health flags the harvest as controversial.
Dealbreakers worth knowing
- Shellfish allergy? Krill is a crustacean — skip it entirely and ask your allergist about fish oil; algal oil is the safe lane.
- On anticoagulants or scheduled for surgery? Omega-3 dosing is a medical conversation first, purchase second.
- Buying the cheapest bottle on the shelf? It’s usually ethyl-ester fish oil — the 20–30% absorption discount means it’s less of a bargain than the price tag suggests.
- Chasing a specific EPA:DHA ratio? Read the supplement-facts panel, not the front label; “1,000 mg fish oil” routinely contains only ~300 mg of actual EPA+DHA.
How we compared
We built this comparison from Mito Health’s 2026 omega-3 supplement guide, the Ulven 2011 bioavailability study in Lipids, and standard label conventions for EPA+DHA content; the annual-cost math is our own. We don’t run lab assays and we don’t make health-outcome claims — our editorial standards explain how we verify supplement-aisle comparisons.
Common questions
Is krill oil better absorbed than fish oil?
Research says yes — the phospholipid form absorbs meaningfully better, with the Ulven 2011 study in Lipids the standard citation. But krill delivers so much less EPA+DHA per gram, at such a higher price, that fish oil still wins on delivered omega-3 per dollar.
Is algal oil as good as fish oil?
For DHA, it’s the same molecule from a tank instead of a fish, and it’s the only vegan option among the three. Expect to pay roughly two to three times fish-oil prices for an equivalent dose, and check labels if you want meaningful EPA too.
What does triglyceride form mean on a fish oil label?
It’s the oil’s natural chemical structure, versus the cheaper-to-make ethyl-ester form used in many budget concentrates. Triglyceride-form oils absorb better — ethyl esters run 20–30% lower per Mito Health — so TG form is the spec worth paying for.
How much EPA and DHA per day do I need?
Common maintenance guidance runs 1,000–2,000 mg of combined EPA+DHA daily, per Mito Health’s guide, but the right number for you depends on diet and health status — that’s a question for your doctor, especially at higher doses.
Auditing the rest of your supplement shelf? We’ve run the same money-first math on creatine monohydrate vs. HCl vs. gummies, whey isolate vs. concentrate vs. hydrolysate, and greens powders vs. multivitamins vs. real vegetables. More in Supplements & Protein.
