Omega-3 Fatty Acids and Skin — Anti-Inflammatory Action, Photoprotection and Supplementation

Omega-3 fatty acids are among the most thoroughly researched dietary components when it comes to health. Most people associate them with protecting the heart and brain — but their impact on the skin is just as fascinating and increasingly well documented. The key question: can omega-3 supplementation genuinely improve the condition of your skin?

EPA and DHA — the anti-inflammatory mechanism

The two most important omega-3 acids for the skin are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). Both come mainly from oily marine fish (salmon, mackerel, sardines, herring).

Their anti-inflammatory action rests on a specific biochemical mechanism. EPA competes with arachidonic acid (AA, an omega-6) for the same enzymes — cyclooxygenase (COX) and lipoxygenase (LOX). When omega-6 dominates the diet (the typical Western diet), these enzymes produce pro-inflammatory series-2 prostaglandins and series-4 leukotrienes. When we increase EPA intake, the body instead generates series-3 prostaglandins and series-5 leukotrienes, which are far less inflammatory.

On top of that, EPA and DHA are precursors of resolvins, protectins and maresins — specialised pro-resolving mediators (SPMs) that actively switch off inflammation rather than merely suppressing it.

Photoprotection — sun protection from within?

One of the most intriguing aspects of omega-3 is its potential photoprotective action — that is, protecting the skin against UV damage from the inside out.

A landmark study by Rhodes et al. (2003), published in the Journal of Investigative Dermatology, showed that EPA supplementation (4 g/day for 3 months) increased the minimal erythema dose (MED) by 36% in participants. This means the skin needed more UV radiation before it reddened — in other words, it was more resistant to sunburn.

The mechanism likely involves:

• A reduced pro-inflammatory response to UV (less prostaglandin E2).
• Protection against UV-induced immunosuppression.
• A reduction in oxidative DNA damage in keratinocytes.

An important caveat: omega-3 does NOT replace sunscreen. The photoprotective effect is moderate and serves only as an additional layer of protection, not an alternative to UV filters. Always use an SPF cream — browse the products available in the PurScore search engine.

Atopic dermatitis — promising data

Atopic dermatitis (eczema) is a chronic inflammatory condition in which the skin barrier is impaired and the immune system overreacts. Given its anti-inflammatory action, omega-3 seems a logical therapeutic candidate.

A systematic review by Bath-Hextall et al. (2012), published as part of Cochrane, analysed trials of omega-3 and omega-6 supplementation in eczema. The results were mixed: some studies showed an improvement in symptoms (less itching, milder lesions), but the overall quality of evidence was rated as low.

More recent research (Koch et al., 2017) suggests that EPA at a dose of 1–3 g/day may reduce the severity of eczema, particularly in adults — but larger and longer clinical trials are needed. In children with eczema, the data are even more limited.

If you suffer from eczema, discuss supplementation with a dermatologist — omega-3 may be a complement, but it won't replace pharmacological treatment.

Fish oil vs flaxseed oil — the ALA conversion problem

This is a crucial distinction, especially for people on a plant-based diet. ALA (alpha-linolenic acid) — the omega-3 found in flax, chia and walnuts — must be converted in the body into EPA and DHA.

The problem is that conversion of ALA to EPA is just 5–10%, and to DHA below 5% (Burdge and Calder, 2005, Prostaglandins, Leukotrienes and Essential Fatty Acids). This means a tablespoon of flaxseed oil delivers far less active omega-3 than a serving of salmon.

For those on a plant-based diet, an alternative is microalgae oil (Schizochytrium sp.), which supplies EPA and DHA directly — without going through fish (it's actually from algae that fish obtain their omega-3 in the first place).

Omega-3 and acne

Acne vulgaris is an inflammatory condition, so omega-3 could theoretically help. A pilot study by Rubin et al. (2008) showed an improvement in patients with inflammatory acne following EPA supplementation. However, the evidence base is still too small to make firm recommendations.

Omega-3 probably won't clear acne on its own — but it may be one element of a comprehensive strategy that includes a low-glycaemic diet, appropriate skincare and dermatological treatment.

Supplementation — how much and in what form?

Based on the available research, the optimal omega-3 dose for skin benefits is 1–3 g of EPA+DHA per day. Here are some practical tips:

• Fish oil — check the EPA and DHA content on the label (not the total omega-3 content). A "1000 mg fish oil" capsule may contain only 300 mg of EPA+DHA.
• The triglyceride form is better absorbed than the ester form — look for the designation "TG form" or "triglyceride".
• Microalgae oil — a good option for vegetarians and vegans.
• Diet — 2–3 servings of oily fish per week provide a sufficient amount.

The effects of omega-3 supplementation on the skin appear after at least 8–12 weeks — this is not a quick fix. You'll find more about active ingredients in cosmetics on the PurScore ingredients page.

Summary

• EPA and DHA have a proven anti-inflammatory effect via the prostaglandin pathway.
• Omega-3 may boost photoprotection, but it does NOT replace UV filters.
• For eczema and acne — the data are promising but inconclusive.
• Flaxseed oil (ALA) is far less effective than fish or algae oil (EPA/DHA).
• Optimal: 1–3 g of EPA+DHA per day, or 2–3 servings of fish per week.