Home / Dafeepedia / What is ALA?

What is ALA (alpha-linolenic-acid)?

What are the physiological roles of DHA?

What are the sustainability considerations around DHA sources?

Alpha-linolenic acid (ALA) is an essential omega-3 fatty acid of plant origin.

"Essential" means that the human body cannot synthesize it and must obtain it through diet.

ALA is the main omega-3 found in plant-based foods such as flax seeds, chia seeds, walnuts, and sacha inchi. It plays a fundamental role in lipid metabolism and serves as a metabolic precursor to the long-chain omega-3 fatty acids EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).

Understanding ALA is essential for understanding plant-based omega-3 nutrition.

What is the chemical structure of ALA?

ALA belongs to the family of polyunsaturated fatty acids (PUFAs).

Its structure contains:

18 carbon atoms
3 double bonds
The first double bond is located on the third carbon atom from the methyl end.

For this reason, it is classified as 18:3 n-3.

The position and number of double bonds influence:

Membrane fluidity
Enzymatic interactions
Metabolic pathways
Structural behavior within lipid bilayers

Why is ALA considered essential?

Humans lack the enzymatic machinery necessary to introduce a double bond at the omega-3 (n-3) position of a fatty acid.

Therefore, ALA must be obtained through diet.

Once ingested, ALA can follow metabolic pathways that convert it into EPA and DHA through a series of elongation and desaturation steps. However, this conversion is limited and influenced by several physiological factors.

What are the physiological roles of ALA?

1. Contribution to cardiovascular function

According to the European Food Safety Authority (EFSA), alpha-linolenic acid contributes to the maintenance of normal blood cholesterol levels when consumed as part of a balanced diet.

This approved health claim applies specifically to ALA.

2. Contribution to membrane structure

Cell membranes are composed of a phospholipid bilayer.

The types of fatty acids incorporated into this bilayer influence:

Fluidity
Permeability
Receptive function
Signal transmission
Polyunsaturated fatty acids such as ALA contribute to the composition and structural balance of membranes.

3. Metabolic precursor of EPA and DHA

ALA serves as a precursor to the longer-chain omega-3 fatty acids EPA and DHA.

The conversion process includes:

Δ6-desaturase
elongase enzymes
Δ5-desaturase
The efficiency of conversion varies depending on:

Biological sex
Overall diet
Omega-6/omega-3 ratio
Genetic factors
The process is regulated and limited, meaning that ALA has independent physiological importance beyond its conversion.

What amount of ALA is recommended?

Recommendations vary slightly from one health authority to another.

In Europe, the recommended daily intake for adults is generally around 2 grams.

This amount can be achieved through:

5 ml of Sacha Inchi oil

1 to 2 tablespoons of ALA-rich oil
The incorporation of vegetable oils naturally rich in omega-3 fatty acids
Dietary context is important. ALA intake should be considered within the broader context of total fat intake and overall nutritional profile.

How does ALA interact with the Omega-6/Omega-3 balance?

ALA and omega-6 fatty acids share metabolic enzymes.

A diet excessively high in omega-6 can influence metabolic competition in desaturation and elongation pathways.

This is why overall dietary balance plays a role in omega-3 physiology.

Written by the Dafee Science Team — published 12/03/2026. Dafeepédia content is developed from European regulatory sources (EFSA, EC Regulation 432/2012) and peer-reviewed scientific literature, and reviewed for accuracy before publication.

Daily-Feed by Dafee provides plant-based ALA, the metabolic precursor to both EPA and DHA. Discover daily-feed

Language