ALA or fish oil? Plant and animal sources of Omega‑3

"Omega‑3" is not a single substance but an entire family of fatty acids. From a nutritional point of view, three are the most important: ALA (alpha‑linolenic acid), EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). Understanding the differences between them allows you to make informed decisions when choosing a supplement.

ALA — plant-based Omega‑3

ALA is the "starting acid" of the whole family. You will find it in linseed, linseed oil, walnuts, chia seeds and rapeseed. The human body is able to convert ALA into EPA and DHA — and it does so to the extent that it needs them. The degree of this conversion can vary from one individual to another, but ALA remains the only source of Omega‑3 that is fully plant-based and independent of fishing.

EPA and DHA — "ready-made" Omega‑3

EPA and DHA are longer, more processed forms. They occur mainly in oily sea fish and in algae (the latter being the original source, in fact — fish obtain DHA by eating plankton). These are forms that the body can use directly, without the need for conversion.

The strengths and weaknesses of fish oil

Advantages: direct availability of EPA and DHA, a rich body of research. Disadvantages that are talked about less often:

• Stability. EPA and DHA are very susceptible to oxidation — some fish preparations go rancid, which can be noticeable as a "fishy aftertaste" and burping.
• Purity of the raw material. Sea fish can accumulate environmental contaminants; quality depends on the purification process.
• Acceptability. For many people, the fishy taste and smell are a barrier to regular use.

The strengths and weaknesses of ALA

Advantages: fully plant-based (important for vegans and vegetarians), no fishy aftertaste, usually greater stability, and also something exceptional — for ALA there is an officially approved EU health claim regarding the maintenance of normal blood cholesterol levels (with an intake of 2 g per day). The weaker side: conversion to EPA/DHA can be limited, which is why people with a particular need for DHA (e.g. in certain clinical situations) should discuss this with a doctor.

"By giving fish oil, we supply ready-made metabolites. By giving ALA, we provide the body with a precursor that can be used in the natural Omega‑3 conversion pathways." — Dr Andrzej Vogt, creator of ESTRALA technology

Form matters

Regardless of the source, quality is also determined by the chemical form and method of production. Omega‑3 are sensitive to oxygen, light and temperature. That is why the production method (e.g. in an oxygen-free atmosphere), storage conditions and the reporting of stability indicators are just as important as the mere declaration that something "contains Omega‑3".

Which path should you choose?

There is no single right answer for everyone. If you regularly eat oily fish — you have a good source of EPA and DHA. If you don't eat fish, follow a plant-based diet or are put off by the fishy aftertaste, a plant-based source of ALA is a natural, convenient choice. Many specialists even suggest combining sources: fish plus plant-based Omega‑3.