Fish oil is the most widely supplemented source of the omega-3 fatty acids EPA and DHA, with decades of research behind it. It's also one of the most confusing categories to shop for: products label their omega-3 content inconsistently, concentration varies from 30% to over 80% EPA+DHA per softgel, and the price difference between the cheapest and most expensive option can be 10× or more for the same daily dose. The number on the front of the bottle — typically "1,000mg Fish Oil" — tells you almost nothing about what you're actually getting, because the active compounds are EPA and DHA, not the carrier oil.
This page ranks fish oil products by cost per month at a reference dose of 1,000mg combined EPA+DHA per day. The typical supplemental range is 1,000–2,000mg/day; you can adjust the dose on the compare page. Every product is priced from the same retailer (Amazon), and the EPA+DHA amounts are extracted directly from each product's Supplement Facts label — not from marketing claims or product titles.
Prices as of April 23, 2026. Prices update daily; this page updates monthly. For current prices and full interactive filters, see the Omega-3: Fish Oil compare page.
| Rank | Brand | Product | Form | Cost per month | Price |
|---|---|---|---|---|---|
| 1 | Arofum | Omega 3 Fish Oil with Vitamin D3 K2 – 300 Lemon Flavored Bu… | Softgels | $3.20 | $17.99 |
| 2 | Amazon Elements | Amazon Elements Super Omega-3, Wild-Caught Fish Oil, Natura… | Softgels | $5.27 | $11.60 |
| 3 | Piping Rock | Piping Rock Omega 3 Fish Oil Liquid Supplement | 16 Fl Oz… | Liquid | $5.41 | $17.99 |
| 4 | KIRKLAND | Kirkland Signature Fish Oil 1000 mg, 400 Softgels (2 Pack) | Softgels | $6.18 | $41.19 |
| 5 | Carlyle | Carlyle Fish Oil Omega 3 Supplements | 2000mg | 320 Softg… | Softgels | $7.18 | $22.99 |
| 6 | NOW Foods | NOW Foods Supplements, Omega-3 180 EPA / 120 DHA, Molecular… | Softgels | $7.34 | $14.69 |
| 7 | Nature Made | Nature Made Fish Oil Omega 3 Supplements, 1200 mg Softgels,… | Softgels | $8.49 | $12.74 |
| 8 | BulkSupplements | BulkSupplements.com Fish Oil 1000mg Softgels - Fish Oil Sup… | Softgels | $8.74 | $20.97 |
| 9 | Saajoor | Vegan Omega-3 Gummies1000mg for Adults - Sugar Free Supplem… | Gummies | $9.99 | $9.99 |
| 10 | Sports Research | Sports Research® Omega-3 Fish Oil, 8oz Glass Bottle - 4685m… | Liquid | $10.97 | $42.95 |
See all products with full filter and sort options →
The cheapest product in this category is Arofum Omega 3 Fish Oil with Vitamin D3 K2 – 300 Lemon Flavored Bu… at $3.20 per month. The most expensive is Nature Made Fish Oil Gummies, 90 Softgels, with Heart-Healthy Omega 3s… at $210.41 per month — a 65.8× premium.
EPA+DHA content is what matters, not "fish oil" weight. A standard 1,000mg fish oil softgel typically contains only 300mg of combined EPA+DHA — the rest is other fatty acids with no established health benefit. A concentrated product might pack 700–900mg of EPA+DHA into the same capsule. When comparing prices, cost per mg of EPA+DHA is the only meaningful metric. This is what TrueServing normalizes to.
Triglyceride form absorbs better than ethyl ester. Fish oil supplements come in two molecular forms: triglyceride (TG, including re-esterified TG or rTG) and ethyl ester (EE). Research consistently shows TG forms produce higher blood levels of EPA and DHA in short-term studies — roughly 30–50% more absorption than EE at the same dose. Over months of daily use, the gap narrows but doesn't fully close. Ethyl ester products are cheaper to produce and dominate the budget tier. Most labels don't disclose the form; if a product says "triglyceride form" or "rTG," it's a deliberate choice worth noting. If it says nothing, it's almost certainly ethyl ester.
Higher concentration means fewer capsules. A 30% concentrate requires 3–4 standard softgels to reach 1,000mg EPA+DHA. A 70%+ concentrate gets there in 1–2. Fewer capsules per day improves compliance and reduces total oil consumed (relevant for those sensitive to fishy aftertaste or digestive side effects). Concentrated products cost more per bottle but often less per mg of EPA+DHA.
Check for oxidation. Fish oil degrades when exposed to heat, light, or air. Oxidized fish oil tastes rancid, smells stronger, and may lose efficacy. Products that disclose TOTOX values (a measure of total oxidation) or IFOS certification signal manufacturing quality. Fishy burps are often a sign of oxidation rather than an inherent property of fish oil. Storing supplements in the refrigerator slows degradation.
Third-party testing matters here more than most categories. Fish oil carries contamination risk from heavy metals (mercury, lead), PCBs, and dioxins — all of which bioaccumulate in marine food chains. Products with IFOS, NSF, or USP certification have been independently verified for purity and potency. This is one category where paying attention to the testing badge is worth it.
Softgels vs. liquid. Most fish oil products are softgels. Liquid fish oil (typically flavored) is available and offers precise dosing flexibility, but it oxidizes faster once opened and must be refrigerated. Cost per mg is often competitive with softgels; the tradeoff is convenience and shelf stability.
Fish oil supplementation for cardiovascular health has the strongest evidence base of any supplement category on this site. Multiple large RCTs and meta-analyses link EPA+DHA intake to reduced risk of heart attack and cardiovascular death, particularly at doses of 1,000mg/day or higher. The American Heart Association recommends omega-3 supplementation for patients with existing heart disease. Emerging research also supports roles in reducing triglycerides, supporting joint health, and cognitive function, though these applications have smaller and more mixed evidence. At standard doses (1,000–2,000mg EPA+DHA/day), fish oil is well tolerated. Higher doses (above 3,000mg/day) have been associated with a modest increase in atrial fibrillation risk in some large studies, which is worth discussing with a doctor for those with a history of heart rhythm issues. Common side effects at any dose include fishy aftertaste and mild GI discomfort, both of which are typically reduced with higher-quality or triglyceride-form products taken with food.