Does omega-3 protect your skin from sunburn?
Omega-3 may offer some protection against sunburn reactions, but the evidence from good studies is too limited and no proven protective dose is known. Simply continue using sunscreen and regard omega-3 at most as a possible supplement.
Omega-3 offers some protection against sunburn, but it has not been studied enough to recommend it for that purpose. Several reviews describe that omega-3 fatty acids can reduce the redness caused by UV radiation. This works through anti-inflammatory action: omega-3 inhibits the production of substances that skin cells release when they are damaged by the sun. The effect is limited and absolutely does not replace sunscreen.
There is no proven dose for UV protection through capsules. There is no scientific consensus on how much you would need to take or for how long. On a label you look for EPA + DHA, but as long as there is no proven amount, you do not know exactly what you are choosing. The fact that omega-3 works through a different mechanism than sunscreen makes no difference for this purpose: it does not change the absence of good evidence.
Whether omega-3 also prevents skin cancer has not been demonstrated in humans. In animal and laboratory research, omega-3 fatty acids suppressed the UV-related cancer stimulus, while omega-6 fatty acids actually amplified it. But large studies in humans are lacking. For melanoma, there are only preliminary indications through antioxidative and immune-modulating effects. Researchers also warn that some substances can have adverse effects at high doses.
EPA does have a demonstrable effect when applied topically. Applied as a cream to the skin, EPA reduced UV-related skin thickening in human studies and inhibited the breakdown of collagen. That is relevant for sun-related skin ageing, but in that case it concerns a skin cream containing EPA, not fish oil capsules. If you want to try omega-3 for your skin, choose a capsule with EPA + DHA on the label, but be aware that there is no proven amount or duration for this purpose and that it is probably not worth your money if you expect UV protection from it.
Based on multiple human and animal experimental studies plus reviews (PMID 15189118, 12133200, 38256329, 39796494, 25961684, 16467281, 37264742, 41683849). Evidence for erythema reduction is moderately strong; evidence for skin cancer and melanoma prevention is limited to associative or animal experimental data.
Does omega-3 from fish or flaxseed help give you better-looking skin?
Omega-3 from fish oil has the strongest evidence base for skin conditions involving inflammation, such as eczema or psoriasis, but results are mixed and no proven optimal dose exists. Flaxseed omega-3 has a weaker effect. If you want to try it for a skin complaint, discuss it with your doctor.
Does sunscreen also protect against skin ageing?
Sunscreen demonstrably protects against sun-related skin ageing, including wrinkles, age spots and loss of skin texture. Daily use of a broad-spectrum sunscreen is the best-supported choice for this purpose.
Does astaxanthin help protect your skin from the sun?
Astaxanthin (4 mg per day, for at least 9 to 10 weeks) appears to give the skin some extra UV resistance, but should never replace your sunscreen: the protection is limited and the evidence largely rests on small studies in Japanese women, often funded by commercial parties.
How much sun is safe, and does the tanning bed really cause skin cancer?
Tanning beds genuinely cause skin cancer: the evidence is causal and strong. Short, regular sun exposure is beneficial for vitamin D, but burning must be avoided at all times.
Does omega-3 from fish oil help with chronic inflammation?
Omega-3 from fish oil lowers inflammation markers in the blood and has the strongest evidence in rheumatoid arthritis. The effect varies by condition and by person; if you have a joint condition, talking to your doctor is the logical first step.
Does taking omega-3 help you stay healthy for longer?
Omega-3 reliably lowers blood fats, but the evidence that it helps you live longer or stay healthier is limited. If you already have heart disease, discuss with your doctor whether omega-3 is a worthwhile addition to your treatment.