Guide
Fish oil vs algae oil
Fish oil and algae oil are both sources of EPA and DHA, and a 2025 trial found the two comparably bioavailable. What differs is the source, the EPA-to-DHA ratio, and who each is aimed at.
Fish oil and algae oil are both sources of EPA and DHA, the two omega-3 fats most research is actually about — not the oil itself. A 2025 randomized trial found algae-derived DHA and EPA raised blood levels about as well as fish oil did over 14 weeks. What actually differs is the source, the typical EPA-to-DHA ratio, and whether it's animal- or plant-derived.
What's actually different
| Point | Fish oil | Algae oil |
|---|---|---|
| Source | Fish body tissue (our label lists sardines and anchovies) | Cultivated marine microalgae |
| Typical EPA:DHA ratio | Often EPA-dominant or balanced (ours is 180 mg EPA to 120 mg DHA per softgel) | Usually DHA-dominant; some products are DHA-only, with little or no EPA |
| Vegan | No — a fish-derived oil, typically in a gelatin softgel | Yes — the common plant-derived EPA/DHA source |
| Bioavailability | Reference standard in most comparison trials | Statistically non-inferior to fish oil in a 2025 randomized trial |
What the bioavailability evidence actually shows
The dose-matching question — whether the body absorbs and uses algae-derived omega-3s as well as fish-derived ones — has been tested directly. A 2025 randomized, double-blind, placebo-controlled trial gave 74 adults either a microalgal-oil or a fish-oil omega-3 supplement and measured plasma phospholipid DHA and EPA at 6 and 14 weeks. The result: algae oil's bioavailability was statistically non-inferior to fish oil's, despite the two oils being produced very differently. That's a real answer to "does algae oil work as well," not a marketing claim — it's a direct human comparison.
What that trial didn't test is EPA content specifically. Many algae oil products on the market are DHA-only or heavily DHA-weighted, because DHA is what algae naturally produce in useful quantity; EPA-rich algae oil exists but is less common and often more expensive to produce. If you're specifically after EPA — the fat most of the outcome-focused research uses at higher doses — checking the EPA line on an algae oil label matters more than checking the DHA line.
Why someone chooses one over the other
- Vegan or vegetarian. Algae oil is the source for anyone avoiding fish-derived ingredients; fish oil, including ours, is not vegan (see fish oil side effects for what's actually in a fish oil softgel).
- Fish allergy or sensitivity. Algae oil sidesteps the fish and shellfish allergen questions that come with a fish-derived product.
- Sustainability concerns. Algae oil doesn't depend on wild or farmed fish stocks, which is part of why it's marketed as the more sustainable source.
- EPA specifically. Fish oil concentrates more reliably deliver a meaningful EPA dose alongside DHA; an EPA-focused buyer should check the label either way.
- Taste and burping. Both oils can cause a fishy or oily aftertaste; neither format is reliably free of it without additional processing.
Our product
Electric Tiger Omega-3 is a fish oil softgel: 1,000 mg of fish oil concentrate per softgel, providing 180 mg of EPA and 120 mg of DHA, one softgel twice daily. Full panel here. As with any fish oil or algae oil product, the dose on the label is what matters for comparison — most outcome-focused trials, in either source, use several times a standard serving; see fish oil dosage for where our amount sits against that research.
Questions people ask
Is algae oil as good as fish oil?
For DHA and EPA bioavailability specifically, a 2025 randomized trial in 74 adults found algae oil statistically non-inferior to fish oil over 14 weeks. "As good" for a particular goal still depends on the EPA amount in the specific product, since algae oil is often DHA-dominant.
Is algal oil the same as fish oil?
No — algal oil comes from cultivated marine algae, and fish oil comes from fish body tissue. Both can supply the same two fats, EPA and DHA, but the source, typical EPA:DHA ratio, and vegan status differ.
Fish oil or algae oil — which should I buy?
That depends on what you're optimizing for: vegan status and sustainability point toward algae oil; a higher, more reliable EPA amount at a given price point more often points toward fish oil. Checking the EPA and DHA amounts on the actual panel, in either case, tells you more than the source alone.
Sources
- Bailey E, et al. Comparative Bioavailability of DHA and EPA from Microalgal and Fish Oil in Adults. Int J Mol Sci 2025. PMID 41096614.
- Flock MR, et al. Determinants of erythrocyte omega-3 fatty acid content in response to fish oil supplementation. PMID 24252845.
- Electric Tiger Omega-3 Supplement Facts: product page.
Related reading: what is fish oil, how to choose a good fish oil, and how much fish oil should you take a day.
Sources
- Comparative Bioavailability of DHA and EPA from Microalgal and Fish Oil in Adults A 2025 trial in 74 adults found algae-oil omega-3 raised blood DHA and EPA levels about as well as fish oil did, over 14 weeks.
- Determinants of erythrocyte omega-3 fatty acid content in response to fish oil supplementation: a dose-response randomized controlled trial In 115 healthy adults, daily doses from 300 mg to 1,800 mg of EPA and DHA raised a blood marker called the omega-3 index in a dose-dependent way over about five months; the trial measured a blood biomarker, not a health outcome.
*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.
