Omega-3 fatty acids, found in fish oil, are best known for heart health, and they also turn up in skin supplements. The reasoning is sound, since omega-3 is anti-inflammatory and part of how the skin barrier works. The evidence for improving skin is real in places and mixed in others, and it is clearest for inflammatory skin conditions rather than general skin appearance.
The short answer
Omega-3 matters for the skin barrier and calms inflammation, so it has a genuine role in skin. The strongest evidence is for inflammatory skin conditions such as eczema and, to a lesser extent, acne, where some trials show benefit and others show none. For general skin appearance in a healthy person, there is little evidence that omega-3 makes a visible difference. It is a good nutrient for overall health, with a modest and inconsistent effect on skin.
Why omega-3 matters for skin
Omega-3 fatty acids, mainly EPA and DHA, are built into the membranes of your cells, including skin cells. A membrane rich in these fats holds water better, which supports a hydrated, intact skin barrier. Omega-3 also lowers the production of inflammatory compounds, and much of skin ageing and many skin conditions involve inflammation. Your body cannot make omega-3, so it depends on diet or supplements. This gives a real reason to expect an effect on skin, especially where inflammation or a weak barrier is involved.
What the research shows
The evidence is strongest for inflammatory skin conditions, and even there it is mixed. In eczema, some trials found that omega-3 supplements reduced redness, dryness, and itching, while others found no significant benefit, so reviews stop short of recommending it routinely. In acne, the picture is similar. Some studies reported fewer breakouts over several weeks, and at least one found that some people improved while others got worse. A dermatology review concluded that the evidence is not strong enough to recommend omega-3 as a standalone acne treatment, though its anti-inflammatory effect makes it worth further study.
For general skin health in people without a specific condition, the evidence is thin. Omega-3 supports the barrier and reduces inflammation in principle, but trials showing that it visibly improves normal skin are lacking.
What it does reliably
Away from skin, omega-3 has stronger evidence for heart health and for lowering inflammation generally, and it is a nutrient many people fall short on. Oily fish such as salmon, mackerel, and sardines are the best source, and two portions a week covers most people. A supplement is a reasonable option for those who eat little fish. Any skin benefit is best seen as a bonus on top of the general health case, rather than the main reason to take it.
The bottom line
Omega-3 has a real role in the skin barrier and in controlling inflammation, and the evidence for improving skin is genuine but mixed. It may help inflammatory conditions like eczema and some cases of acne, though results vary from person to person and it is not a reliable treatment on its own. For normal skin, there is little evidence of a visible effect. As a nutrient for overall health it earns its place, and any skin benefit comes as an extra. For the ingredients with more direct skin evidence, see our guide on which supplements help your skin.
Questions people ask
Does fish oil improve skin?
It supports the skin barrier and reduces inflammation, and it may help inflammatory conditions like eczema and some acne. For general skin appearance, the evidence is thin and mixed.
Does omega-3 help acne?
Some studies show fewer breakouts, others show no change, and a few people worsen. A dermatology review found the evidence too limited to recommend it as a standalone acne treatment.
Is it better to eat fish or take a supplement?
Oily fish such as salmon and sardines is the best source, and two portions a week covers most people. A supplement is a reasonable option if you eat little fish.
How long does omega-3 take to affect skin?
The trials that saw benefits generally ran for several weeks to a few months. As with most supplements, any effect builds gradually rather than quickly.
References
Review of Omega-3 Fatty Acid Dietary Supplementation in Cutaneous Inflammatory Disorders. Journal of Integrative Dermatology. 2025. https://jintegrativederm.org/doi/10.64550/joid.dc39qy52
National Institutes of Health, Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals. https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/
This article is for information only and is not medical advice. Supplements are not meant to diagnose, treat, cure, or prevent any illness. Talk to your doctor before starting anything new, especially if you are pregnant, breastfeeding, or taking medication.
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