Fish oil omega-3 concentrates
EPA and DHA from fish oil, as natural triglycerides, ethyl esters or re-esterified triglycerides
Omega 3Ingredient formSources last checked: October 15, 2026
Medical & Industry Advisor: Dr. James Pendleton, ND
Answer
Fish oil omega-3 is an ingredient form (EPA and DHA from fish oil, as natural triglycerides, ethyl esters or re-esterified triglycerides), sold on the open market with no trademark program. This page lists what to put on a spec sheet, how it is declared on the Supplement Facts label, how it compares with related forms, what published market surveys measured, and the government safety conclusions, each with its source.
Access
- Access model
- Open market
What it is
- Fish oil supplements carry the omega-3 fatty acids EPA and DHA in several forms: natural triglycerides as they occur in fish oil, ethyl esters made from them with ethanol, and re-esterified triglycerides converted back from ethyl esters. A typical fish oil supplement provides about 1,000 mg of fish oil with 180 mg EPA and 120 mg DHA, though amounts vary widely. [NIH Office of Dietary Supplements, Omega-3 Fatty Acids fact sheet]
Forms compared
How fish oil omega-3 compares with related forms on a spec sheet and a label.
| Form | Declared on the label as | Content | Identity check |
|---|---|---|---|
| Natural triglyceride fish oil | Fish oil, with EPA and DHA listed by amount per serving | Example: anchovy oil, 27–34% EPA + DHA (area %), not concentrated[GOED Technical Guidance Document, 2026-10-15] | Lipid class (triglyceride) and EPA and DHA in mg per gram with the basis stated |
| Ethyl ester concentrate | Fish oil concentrate, with EPA and DHA listed by amount per serving | At least 93% fatty acid ethyl esters[GOED Technical Guidance Document, 2026-10-15] | Lipid class by a method such as NMR; the spec and label name the ethyl ester form |
| Re-esterified triglyceride concentrate | Fish oil concentrate, with EPA and DHA listed by amount per serving | Triglycerides at least 50%, ethyl esters plus free fatty acids at most 5%, oligomers at most 3%, EPA + DHA at least 45%, total omega-3 at least 60% (Ph. Eur. monograph 1352 as restated by GOED)[GOED Technical Guidance Document, 2026-10-15] | Lipid class distribution on the CoA, against these figures |
On the Supplement Facts label
Fish oil has no Daily Value, so it is listed with its amount by weight per serving and a symbol, such as an asterisk, that refers to “Daily Value not established”. EPA and DHA are constituents that may be listed indented beneath it with their amounts per serving. Once a value is declared, compliance follows 21 CFR 101.9(g): a naturally occurring (class II) nutrient must be at least 80% of the declared value, and an added (class I) nutrient at least 100%.[21 CFR 101.36(b)(3)(iii), 101.36(b)(3)(iv) and 101.36(f)(1), 2026-10-15][21 CFR 101.9(g)(3) and 101.9(g)(4), 2026-10-15]
Spec parameters buyers should demand
What to ask for on the certificate of analysis and spec sheet. Identity, quality, and regulatory parameters only. This is not advice about efficacy.
| Parameter | What to ask | Why it matters |
|---|---|---|
| Form (lipid class) | State natural triglyceride, ethyl ester or re-esterified triglyceride on the spec, and ask for the lipid class result on the CoA.[NIH Office of Dietary Supplements, Omega-3 Fatty Acids fact sheet] | The forms are made differently, and the spec and label should name the one you buy. |
| EPA and DHA content and basis | Request EPA and DHA in mg per gram with the basis stated: as free fatty acid, triglyceride or ethyl ester.[GOED Monograph, version 9.1] | The same oil gives a different mg per gram figure on each basis; GOED's monograph expresses EPA and DHA as free fatty acid equivalents. |
| Oxidation through shelf life | Set peroxide value at most 5 meq/kg, p-anisidine value at most 20 and TOTOX at most 26, met through the end of shelf life (GOED Monograph, voluntary).[GOED Monograph, version 9.1] | GOED applies its limits throughout the product's stated shelf life, not only at release. |
| Flavored oils | For a flavored oil, ask for the p-anisidine value of the unflavored base oil and the test method GOED's technical guidance describes for flavored oils.[GOED Monograph, version 9.1][GOED Technical Guidance Document] | GOED states its p-anisidine and TOTOX limits do not apply to flavored oils because of inaccuracies with the p-anisidine method. |
| Dioxins and PCBs | Set total dioxins, furans and dioxin-like PCBs at most 3 pg WHO-TEQ/g and total PCBs at most 0.09 mg/kg (GOED). The EU legal maximum for marine oils sold to consumers is 6.0 pg/g fat for dioxins plus dioxin-like PCBs.[GOED Monograph, version 9.1][EU Regulation 2023/915, item 4.1.10] | The voluntary industry limit is stricter than the EU legal maximum, so the CoA should name the limit it was tested against. |
| Heavy metals | Set lead below 0.05 mg/kg, cadmium below 0.1 mg/kg, mercury below 0.1 mg/kg and inorganic arsenic below 0.1 mg/kg (GOED).[GOED Monograph, version 9.1] | GOED's arsenic limit is for inorganic arsenic, so ask for that result, not total arsenic alone. |
| Species, country and lab | Ask for the fish species and country of manufacture on the CoA, and for third-party results from a lab accredited for that test, for example to ISO/IEC 17025.[GOED Monograph, version 9.1] | GOED's monograph asks for both, and a species statement is the identity record when an oil's origin is questioned. |
| Identity verification | Confirm the manufacturer runs at least one appropriate identity test on each incoming lot, as 21 CFR 111.75(a)(1) requires for every dietary ingredient unless FDA has granted a petition exemption.[21 CFR 111.75(a)(1)] | Identity testing is a federal manufacturing requirement and the control that catches a substituted oil. |
Published market surveys
Totals as each study reports them: what was measured, how many products, and the result. Methods and sampling differ between studies.
| Measured | Study | Market, products tested | Result | Funding or affiliation |
|---|---|---|---|---|
| Oxidation | Albert et al., Scientific Reports 2015 | New Zealand, n=36 | 30 of 36 products (83%) exceeded the recommended peroxide value, 9 (25%) the anisidine value and 18 (50%) the Totox value; 3 (8%) met all three. | Independent |
| Oxidation | Pasini et al., Biomolecules 2022 | France (unflavored omega-3 supplements from several oil sources, including fish, microalgae and linseed oils), n=20 | All 20 products met GOED's peroxide value, p-anisidine value and Totox limits. | Independent |
| Identity | Weinbinder et al., Foods 2025 | Spain (omega-3 supplements from several oil sources; the finding covers the fish oil concentrate products among the 17), n=17 | Ethyl esters, not indicated on the labels, were found in most fish oil concentrate products, sometimes as the main lipid class. | Independent |
Government safety conclusions
| Limit or safety conclusion | Population | Source wording |
|---|---|---|
| 5 g/day of EPA and DHA combined: FDA's safety conclusion, not a cap (FDA considers products above it lawful) | Dietary supplements used as recommended in their labeling (FDA, 2019) | Therefore, we conclude that dietary supplements that provide no more than 5 g/day EPA and DHA when used as recommended or suggested in their labeling are safe and lawful under 21 CFR 101.14(b)(3)(ii).[source, read 2026-10-15] |
| 1 g/day of supplemental DHA alone (a safe level of intake, not an upper limit) | All population groups; applies to sources with DHA alone or mostly DHA (EPA/DHA ratio below 0.3) (EFSA, 2026) | Based on the available evidence, the Panel retains the safe level of intake of 1 g/day for supplemental DHA alone established in 2012 for all population groups (i.e. infants, children, adolescents and adults, including pregnant and lactating women).[source, read 2026-10-15] |
Government statements, quoted
Natural triglycerides are the form that occur naturally in fish oil, whereas ethyl esters are synthesized from natural triglycerides by replacement of the glycerol molecule of the triglyceride with ethanol. Re-esterified triglycerides are formed by the conversion of ethyl esters back to triglycerides. Omega-3s as re-esterified triglycerides, natural triglycerides, and free fatty acids have somewhat higher bioavailability than ethyl esters, but consumption of all forms significantly increases plasma EPA and DHA levels [33,35].
Although seafood contains varying levels of methyl mercury (a toxic heavy metal) [31], omega-3 supplements have not been found to contain this contaminant because it is removed during processing and purification [32].
Because the current scientific evidence does not show that dietary supplements that provide more than 5 g/day EPA and DHA are adulterated under the food safety provisions of the Federal Food, Drug, and Cosmetic Act, such products are lawful.
Reference list
- NIH Office of Dietary Supplements, Omega-3 Fatty Acids Health Professional Fact Sheet (updated August 22, 2025) Government reference
- GOED Monograph, version 9.1 (issue date July 23, 2026) Industry standard
- GOED Technical Guidance Document (cover dated July 16, 2026) Industry standard
- FDA letter on EPA and DHA, Docket No. FDA-2014-Q-1146 (June 2019) Government reference
- EFSA Scientific Opinion on the tolerable upper intake level for supplemental DHA, EFSA Journal 2026;24(1):e9858 Government reference
- Commission Regulation (EU) 2023/915 on maximum levels for certain contaminants in food Regulatory
- 21 CFR 101.36: Nutrition labeling of dietary supplements Regulatory
- 21 CFR 101.9(g): compliance classes and label-value requirements Regulatory
- Albert et al., fish oil supplements in New Zealand: label content and oxidation, Sci Rep 2015;5:7928 Market survey
- Pasini et al., omega-3 supplements on the French market, Biomolecules 2022;12:1361 Market survey
- Weinbinder et al., 1H NMR of fish oil supplements on the Spanish market, Foods 2025;14:4217 Market survey
A reference list is not claim substantiation. Under the FTC's Health Products Compliance Guidance (December 2022), marketing claims about a finished product require competent and reliable scientific evidence, typically randomized, controlled human clinical testing. Responsibility for substantiating product claims rests with the brand.
Manufacturers with stated capability
No manufacturer has a listed capability for this ingredient yet. Listings are positive-only: an entry states a manufacturer can run the ingredient, never that one cannot.
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Further reading
The decision framework behind this reference: five checkable criteria for choosing between a branded ingredient and its generic form.
What this page does not tell you
- Which supplier to buy from, pricing, minimum order volumes, or contract terms.
- Anything about efficacy. This is an identity, labeling, and quality reference.
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