FORMULAS, EXPLAINED

Ingredient index

What familiar skincare ingredients may do, how to use them and where the evidence has limits.

INGREDIENT INDEX

Can Melatonin Work in Topical Skin Care?

A clear-eyed guide to melatonin in skincare: what the ingredient can plausibly contribute, what the research does not yet prove and how to use it without overpromising.

8 min read

INGREDIENT INDEX

What Hyaluronic Acid Can - and Cannot - Do

Separate the useful hydration role of topical hyaluronic acid from exaggerated claims about permanent plumping or wrinkle correction.

6 min read