Ingredients

Four clues to tell a retinol purge from a breakout, how long purging lasts, and what to do about each.

How tretinoin and retinol differ in strength, speed and irritation, who each one suits, and how to start without wrecking your skin.

Panthenol rarely gets its own spotlight the way retinol or vitamin C do, but check the ingredient list on almost

Glycolic acid gets most of the AHA spotlight, but lactic acid is arguably the more practical choice for a lot

Hydroquinone works fast on dark spots but comes with real irritation and regulatory concerns. Alpha arbutin has become the go-to

Retinol works, but it doesn’t work for everyone — pregnancy, sensitivity, and sun reactivity all rule it out for a

Most facial oils sit on top of skin and feel heavy within minutes. Squalane is the exception — a lightweight

If your skin flares up at the mention of a new active, centella asiatica — usually labeled “cica” — is

Azelaic acid rarely gets the attention retinol or vitamin C does, but it is one of the few ingredients dermatologists

You can spend a fortune on serums, retinol, and peptides — but skip sunscreen, and you are undoing most of