Best ingredients for skin and anti-aging

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

Which skin supplements have real evidence — collagen, antioxidants, vitamin C — and the one factor that beats them all.

What actually ages skin

Before judging any ingredient, it helps to know what drives skin ageing, because most of it isn't a nutrient gap. Sun exposure is overwhelmingly the biggest factor, followed by smoking, sleep and overall diet. That ordering matters: a supplement works at the margins while daily sun protection works at the centre. Any product implying it can reverse ageing while you skip sunscreen is selling the small lever and ignoring the big one.

Collagen peptides: the better-supported claim

Oral collagen is one of the more credible cosmetic supplements. A number of randomised trials suggest hydrolysed collagen peptides can modestly improve skin elasticity and hydration over weeks to months. The studied doses are roughly 2.5–10 g/day taken consistently, so a sachet providing a fraction of a gram is unlikely to match them. The effects are real but modest, and much of the research is industry-funded — worth bearing in mind.

Antioxidants and vitamin C

Vitamin C is a genuine cofactor for the body's own collagen synthesis, which is why it often appears alongside collagen. Antioxidants like grape seed extract and other polyphenols have a protective rationale against oxidative stress, with lighter skin-specific evidence. These can play a supporting role, but they don't outperform the basics, and a balanced diet already supplies much of what they offer.

Oral versus topical

Skin ingredients behave very differently by mouth versus on the skin. Collagen and antioxidants taken orally have modest whole-body effects; the same-named ingredient in a cream acts only where applied. Bakuchiol is a good example — its skin evidence is topical, not oral. So an oral 'glow' supplement and a topical serum aren't interchangeable, even when they share ingredient names.

Realistic expectations and safety

A fair expectation from oral skin supplements is a subtle improvement in skin feel and elasticity with consistent use — not a dramatic anti-ageing transformation. Collagen peptides are generally very safe and well tolerated; the bigger 'risk' is spending on them while skipping the high-impact basics. Vegans should note collagen is animal-derived and would need a different approach.

What does more than any capsule

The highest-impact skin routine is unglamorous: daily broad-spectrum sun protection, not smoking, enough sleep, adequate protein and managing stress. A collagen or antioxidant supplement can sit on top of that for a modest extra, but it can't substitute for it. Spending on supplements while ignoring sunscreen is, bluntly, money poorly allocated.

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Frequently asked questions

This article is general information, not medical advice. See our medical disclaimer, and talk to a qualified healthcare professional about your own situation.