Which actives actually work
Only a handful of anti-wrinkle ingredients have solid evidence behind them: retinoids, vitamin C, niacinamide, chemical exfoliants and daily broad-spectrum sunscreen. Below is what each one does, the concentration range that matters, and how long you need to use it before fine lines visibly change.
01
Retinoids and daily broad-spectrum sunscreen carry the strongest evidence for reducing visible ageing. Everything else on this page plays a supporting role around those two.
02
Over-the-counter retinol sits at 0.1% to 1%, vitamin C serums at 10% to 20%, niacinamide at 2% to 5%. Ranges matter more than headline percentages.
03
Retinol is best introduced two or three nights per week and increased gradually to limit irritation. A routine you can keep for months beats an aggressive one abandoned in week three.
Daily broad-spectrum sunscreen is the single most effective anti-ageing measure, because UV exposure drives most visible skin ageing.
Five ingredients account for almost all of the anti-wrinkle effect available from topical products.
Retinol is a vitamin A derivative, sold over the counter at 0.1% to 1%. Retinoids increase skin cell turnover and support collagen production, which reduces fine lines over months of continuous use. Nothing in this class works in a week.
Daily broad-spectrum sunscreen is the single most effective anti-ageing measure, because UV exposure drives most visible skin ageing. Sunscreen is tested at 2 mg per square centimetre of skin — roughly half a teaspoon for the face alone — and applying less quietly reduces protection.
Vitamin C, used as L-ascorbic acid, is an antioxidant commonly formulated in serums at 10% to 20% concentration. Niacinamide (vitamin B3) at 2% to 5% is well tolerated and pairs safely with most other active ingredients.
Each card states the concentration range, the role and the realistic timeline.
| Ingredient | Concentration | Role | Timeline |
|---|---|---|---|
| Retinol | 0.1% to 1% | Increases cell turnover, supports collagen | Fine lines change over months |
| Vitamin C (L-ascorbic acid) | 10% to 20% | Antioxidant in serums | Used daily for ongoing protection |
| Niacinamide (vitamin B3) | 2% to 5% | Well tolerated, pairs with most actives | Supports tolerance continuously |
| Broad-spectrum sunscreen | SPF 30: 97% UVB blocked | Prevents UV-driven ageing | Benefit as daily continuous use |
| Broad-spectrum sunscreen | SPF 50: 98% UVB blocked | Prevents UV-driven ageing | Benefit as daily continuous use |
| Sunscreen dose | 2 mg per cm² | Tested application amount | Roughly half a teaspoon for the face |
| AHAs | A few nights per week | Chemical exfoliation, supporting role | Texture support over weeks |
Figures cited above come from standard formulation and testing references for over-the-counter actives.