An omega-3 bottle can display a large number on the front while the back lists several smaller amounts. To understand omega-3 EPA and DHA, start with three details: the amount of EPA, the amount of DHA and the serving size those figures refer to. The total weight of fish oil or algae oil does not automatically tell you the combined quantity of these two fatty acids.
This guide explains the difference and shows how to read a label using worked examples. The example products are fictional. Their numbers illustrate calculations, rather than the composition, recommended use or health effects of any Good Nature Vibe product.
What are EPA and DHA?
EPA stands for eicosapentaenoic acid. DHA stands for docosahexaenoic acid. They are two distinct members of the omega-3 fatty-acid family.
Another member is ALA, or alpha-linolenic acid. The US National Institutes of Health Office of Dietary Supplements, in its fact sheet updated in 2025, distinguishes these fatty acids and explains that conversion of ALA to EPA and DHA is limited. Its description of supplement formulations also shows why individual amounts matter: fish-oil and algae-oil products can contain different quantities of EPA and DHA.
For label reading, the useful point is straightforward: a declaration of “omega-3” is less specific than separate EPA and DHA amounts. If you want to know how much of each is present, look for both names in the composition table.
EPA vs DHA: what is the difference on a label?
EPA and DHA are different fatty acids, so their quantities need separate entries. A capsule declaring 200 mg of each provides equal amounts; one declaring 300 mg EPA and 100 mg DHA has a 3:1 EPA-to-DHA ratio.
Neither composition alone establishes which is better for an individual. Read both amounts instead of treating the names as interchangeable.
Does every omega-3 product contain both?
Do not assume that it does. Read the actual table. A product might declare DHA and EPA separately, declare only one, or provide a total omega-3 amount without a full breakdown.
If EPA is absent from the table, an algae illustration or the phrase “marine omega-3” cannot tell you its quantity. Ask for the current product specification when the amount matters to your comparison.
Fish-oil weight is different from EPA plus DHA
“Fish oil: 1,000 mg” describes the weight of an oil ingredient. “EPA: 180 mg” and “DHA: 120 mg” describe specific components within that oil.
The NIH Office of Dietary Supplements (2025) gives an illustrative typical formulation containing about 1,000 mg of fish oil, including 180 mg EPA and 120 mg DHA, while stressing that formulations vary widely. Adding the two declared fatty acids gives:
180 mg EPA + 120 mg DHA = 300 mg EPA + DHA.
In that example, the combined EPA and DHA represent 30% of the declared oil weight. The remaining oil weight should not be labelled “waste”: EPA and DHA are components within a larger oil ingredient, and other components may also be present. The example does not establish a universal concentration or a quality ranking.
Also distinguish “total omega-3” from “EPA + DHA”. A total omega-3 figure may include other omega-3 fatty acids. Do not add total omega-3 to EPA and DHA; that can count the same components twice.
How to read an omega-3 label in five steps
1. Find the serving size first
Before comparing numbers, find the heading above them. It might say “per capsule”, “per two capsules”, “per serving” or “per 5 ml”. Those headings change what the figures mean.
A bottle containing 60 capsules is not necessarily a bottle containing 60 servings. With a labelled serving of two capsules, it contains 30 servings. That calculation says nothing about whether the serving is suitable for you; directions and relevant professional advice remain separate questions.
2. Write down EPA and DHA separately
Copy both amounts and their units. Milligrams are often written as mg; grams as g. One gram equals 1,000 milligrams.
If one table says 0.4 g EPA and another says 400 mg EPA, the quantities are the same. Convert them into a common unit before comparing. Keep a missing amount marked as “not declared”, rather than inventing it from a front-label number.
3. Add EPA and DHA once
For a combined amount, add the EPA and DHA figures from the same column. Do not combine EPA per capsule with DHA per two capsules.
For example, 360 mg EPA and 240 mg DHA per two capsules give 600 mg combined per two capsules. Dividing both figures by two gives 180 mg EPA and 120 mg DHA per capsule, or 300 mg combined.
4. Match the numbers to the directions
Check whether the declared serving matches the recommended daily portion. A table may describe one capsule even when the directions specify two, or show a two-capsule serving alongside flexible directions.
Where the label specifies a daily portion, calculate its composition using that portion. Do not increase the number of capsules simply to reproduce another product’s numbers. A fair comparison is a calculation, not an instruction to change your intake.
5. Read the rest of the label
Check the ingredient list, capsule material, relevant allergen information, directions, warnings, storage instructions and best-before date. Note the batch or lot identifier when available.
For a liquid, use the labelled volume and an appropriate measuring device. A household spoon is not a reliable substitute for a stated 5 ml measure. If the label only declares an amount per 100 ml, ask for clarification of the recommended portion rather than guessing.
Worked example: per capsule versus per serving
Here is a fictional label with a recommended portion of two capsules:
| Label entry | Per capsule | Per two-capsule serving |
|---|---|---|
| Fish oil | 1,000 mg | 2,000 mg |
| EPA | 180 mg | 360 mg |
| DHA | 120 mg | 240 mg |
| EPA + DHA, calculated | 300 mg | 600 mg |
The oil weight and combined EPA plus DHA are different measurements. The two-capsule portion contains 2,000 mg of oil and 600 mg of EPA plus DHA. Neither number should be substituted for the other.
An online listing that shows “600 mg” without the serving basis leaves an important question unanswered. Check whether the figure refers to one capsule, two capsules or a daily portion before using it in a comparison.
How to compare two products fairly
When comparing food supplements, use the same serving basis and check the separate EPA and DHA amounts.
Compare the same basis: per capsule, per labelled serving or per recommended daily portion. Record which basis you have chosen.
| Fictional product | Declared serving | EPA per serving | DHA per serving | Combined per serving | Combined per capsule |
|---|---|---|---|---|---|
| A | 2 capsules | 360 mg | 240 mg | 600 mg | 300 mg |
| B | 1 capsule | 200 mg | 200 mg | 400 mg | 400 mg |
Product A declares more EPA plus DHA per serving, while product B declares more per capsule. Both observations are correct. The figures alone do not show which product is suitable for a particular person or which has better manufacturing quality.
You can also calculate how long a bottle lasts at its labelled portion. A bottle of 60 capsules used at two capsules per day represents 30 days; 60 capsules used at one per day represent 60 days. Use the actual pack size and directions when comparing cost.
Comparing a liquid with capsules
Suppose a fictional liquid declares 300 mg EPA and 200 mg DHA per 5 ml. That gives 500 mg combined per labelled 5 ml portion. A capsule product declaring 250 mg combined per capsule gives the same mathematical amount in two capsules.
This does not make their directions interchangeable. Ingredients, warnings and recommended portions can differ. Use the calculation to understand the label, while following the directions for the exact product concerned.
What does the EPA-to-DHA ratio tell you?
A ratio describes the relative amounts. For example, 300 mg EPA and 200 mg DHA produce a 3:2 ratio and a combined amount of 500 mg.
But 150 mg EPA and 100 mg DHA also give a 3:2 ratio, with only 250 mg combined. The same ratio can therefore describe very different quantities.
Record the milligram amounts alongside any ratio. Avoid choosing a product solely because a ratio looks impressive: the ratio is a composition description, not evidence of an individual benefit or an authorised product claim.
Fish oil, algae oil and other label details
The source identifies the oil ingredient; the composition table identifies the quantities. An algae-oil product should be assessed using its declared EPA and DHA, just as a fish-oil product should.
For dietary preferences, inspect the entire ingredient list. Oil origin and capsule material are separate details. Check any vegan or other certification against the documentation for the actual product rather than inferring it from an ingredient image.
Treat words such as “premium”, “concentrated” and “advanced” as prompts to ask more precise questions. What is the combined amount per serving? What does the specification say? Is a named test report linked to this product or batch? A large front-label number cannot answer all three.
Amounts, reference values and product claims
The EFSA NDA Panel (2010) proposed an adequate intake of 250 mg EPA plus DHA per day for adults in its scientific opinion on dietary reference values for fats. This is a dietary reference amount, not a universal instruction to take a particular supplement, and not proof that a named product can make a health claim.
Composition and claim eligibility require separate checks. A product’s label, recommended portion, intended market and all conditions attached to the relevant authorised claim must be considered together. The UK Department of Health and Social Care’s register, updated in 2026, states that only authorised claims may be used in Great Britain. An English-language page alone does not determine the sales jurisdiction.
This guide makes no health-benefit claim for a specific product. A source about an ingredient cannot establish the claim eligibility of an unidentified bottle. Descriptions should remain within what its actual documentation supports.
Questions to ask when information is missing
Send a focused question rather than asking whether a supplement is simply “good”. For example:
- Are the EPA and DHA amounts declared per capsule or per recommended daily portion?
- What are the separate EPA and DHA amounts for the current formulation?
- Does the ingredient list include the capsule shell and any additional ingredients?
- Is a report available for this product or batch, and what does it measure?
- Which storage instructions apply after opening?
If a product document differs from the label in front of you, provide the product name, batch identifier and a photograph so the supplier can resolve the discrepancy. Do not combine figures from different formulations.
Frequently asked questions
Is 1,000 mg of fish oil the same as 1,000 mg of EPA and DHA?
No. Fish-oil weight describes the oil ingredient, while EPA and DHA amounts describe components within it. Read their separate declared amounts and add them using the same serving basis.
How do I calculate EPA and DHA per serving?
Add the EPA and DHA amounts shown for that serving. For example, 360 mg EPA plus 240 mg DHA per two capsules gives 600 mg combined per two-capsule serving.
Does algae oil always contain both EPA and DHA?
Do not assume that it does. Check the separate amounts on the exact product label or specification. If EPA is not declared, ask for clarification rather than estimating its amount.
Can I compare products using only their EPA-to-DHA ratio?
No. The same ratio can occur at different quantities. Compare the EPA and DHA amounts in milligrams, the serving size and the recommended portion as well.
Does a higher EPA and DHA amount prove better quality?
No. A declared quantity describes composition. It does not establish manufacturing quality, suitability for an individual or permission to make a particular health claim.
How Good Nature Vibe approaches product transparency
Good Nature Vibe’s published quality standard (reviewed in 2026) describes checking supplier information and documenting ingredients, quantities, use and warnings. It also sets a clear boundary: a report or Certificate of Analysis is presented only when it is genuinely available and relevant to the product or batch.
For an omega-3 comparison, ask whether the available document identifies the relevant product, sample or batch and the measurements it covers. A report about composition does not automatically demonstrate a health effect.
The standard also rejects unsupported claims that every product is independently tested or that a certificate exists without a verifiable source. It states that skincare becomes orderable only when required product and safety documentation is complete. These are published boundaries, not a claim that every omega-3 product has identical documentation. For the bottle you are considering, check what is actually available.
Conclusion
Reading an omega-3 label starts with the serving size, followed by the separate EPA and DHA amounts. Add those figures once, keep oil weight separate and use the same comparison basis across products.
A useful label lets you connect quantities with ingredients, directions and relevant documentation. If a detail is missing, ask a precise question. Clear composition information helps you understand the product without turning a number into a promise.
