ALA, EPA and DHA are members of the omega-3 family, but they are not interchangeable on a label. The GAPS book discusses plant-derived parent fats, ready-made EPA/DHA in foods and the circumstances in which supplements may be useful. That distinction is the starting point for this guide.[1]
ALA, EPA and DHA
| Name | What It Means Here |
|---|---|
| ALA | Alpha-linolenic acid, the parent omega-3 called LNA in the book |
| EPA | Eicosapentaenoic acid, a longer-chain omega-3 |
| DHA | Docosahexaenoic acid, another longer-chain omega-3 |
The body can convert ALA through a pathway leading to EPA and DHA, but conversion is limited and variable. A source of ALA is therefore not an equal source of ready-made EPA and DHA.[2]
The GAPS Conversion Discussion
In Gut and Physiology Syndrome, Campbell-McBride discusses vitamins C, B3 and B6, magnesium, zinc and enzyme activity in the conversion process. She connects nutritional difficulties and toxic exposure with impaired conversion in some patients. This is her explanation of why a parent-oil supplement may not answer every need.[1]
That does not establish that every person following GAPS converts nothing, or that a food reaction identifies a particular biochemical blockage. The parent-fat guide explains the terminology without turning it into a personal test.
Food Sources of EPA and DHA
The book emphasizes oily fish such as salmon, sardines, mackerel, trout and eel. It discusses algae and phytoplankton as part of the marine source of these fats and names other fish and animal-food examples. EPA and DHA occur in the food, rather than needing the same parent-fat conversion first.[1]
Campbell-McBride describes fresh oily fish at least twice a week as a useful source for healthy people and many people following GAPS. She also describes some children and adults whose digestion makes supplements useful while it improves. This does not impose a trial period of fish eating before every supplement decision.[1]
For meal ideas, use our Full GAPS meal guide and the food forms appropriate to your stage. The nutrient discussion does not make every fish preparation suitable for early Intro.
Cod Liver Oil and Fish Oil
The source discusses both oils, with cod liver oil also providing vitamins A and D. They are not identical products, and serving volumes do not tell you the same thing as the amounts of EPA, DHA, vitamin A or vitamin D. Use the cod-liver-oil guide to keep the label and total-intake questions together.[1]
The author favors natural sources over synthetically made EPA/DHA. Her oil-use discussion also calls for refrigeration and protection from light and oxygen. A general article does not set a personal dose or substitute an old product label for the current one.[1]
The Complete Epilepsy Exception
For people with epilepsy, the 2020 book does not recommend any plant or fish oil supplements for at least the first year of treatment. It reports that supplements can trigger seizures in a proportion of patients and says the reason is unknown. It directs this group toward animal fats in food.[1]
The later consideration is specific: after seizures have stopped for at least six months or longer, someone prone to common colds could consider cod liver oil for immune support during the cold season, beginning with a tiny dose and increasing gradually. This is not permission to restart any oil after six months or automatically at the end of the first year.[1]
Keep both the initial-year restriction and the later conditions together. Any supplement decision belongs with the person’s seizure care; these food and supplement passages do not replace prescribed antiseizure treatment.
A Useful Next Step
Start with what you are actually comparing: a fish meal, an ALA-rich oil or an EPA/DHA supplement. Keep the name and label with your notes. The omega-6 guide explains the other parent family so the two are not confused.
For a record of the actual product, introduction and observations, this is the companion. The Supplement Introduction Tracker is listed in my printable catalog.
For practical meal choices, return to the GAPS fats-and-oils kitchen guide.
References
- Campbell-McBride, N. Gut and Physiology Syndrome (2020), “Omega-3 fats,” EPA/DHA conversion and foods; “Essential fatty acids,” oil handling and the complete epilepsy restriction/later conditional cod-liver-oil passage.
- NIH Office of Dietary Supplements. Omega-3 Fatty Acids: Health Professional Fact Sheet, ALA, LA, EPA/DHA, conversion and food sources.
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