The basics outperform the bottles
The biggest drivers of skin aging are sun exposure and smoking, followed by genetics and overall health. No supplement competes with daily sun protection and not smoking — that's the honest starting point before any 'beauty from within' product [1].
Collagen: promising but unsettled
Collagen peptides are the most-studied skin supplement. Some randomized trials suggest they may modestly improve skin hydration and elasticity, but important caveats apply:
- Much of the research is industry-funded and varies in quality.
- Effects are modest, and ingested collagen is broken down into amino acids — the mechanism for targeted skin benefit is still being worked out.
- It's reasonable to consider, with measured expectations, not as a fountain of youth (see [collagen explained](/learn/collagen-supplements-explained)).
Biotin: only if deficient
Biotin is heavily marketed for skin, hair, and nails, but it only helps if you're deficient — which is uncommon. High-dose biotin can also interfere with lab tests (a real safety note), so more isn't better.
Antioxidants and others
- Vitamin C and E matter for skin biology, but supplementing beyond adequacy hasn't shown clear anti-aging benefit, and topical formulations are a separate topic.
- 'Beauty blends' combining many ingredients at low doses are mostly [marketing](/learn/proprietary-blends-explained).
- A balanced diet supplying protein, vitamins, and minerals supports skin more reliably than exotic add-ins [2].
When skin changes are medical
New or changing skin lesions, persistent rashes, or sudden changes deserve a clinician or dermatologist, not a supplement.
Practical guidance
- Sun protection and not smoking do the most for skin aging.
- Collagen peptides: reasonable to try with modest expectations; evidence is still evolving.
- Biotin only if deficient; beware lab-test interference.
- Eat a balanced diet; skip low-dose 'beauty blends' and see a dermatologist for concerning changes.