The evidence, explained.

"Antioxidant" gets printed on nearly every skincare label — but most of that is marketing shorthand. Here's what antioxidants actually do in skin, and which ones the evidence actually supports.

Retinol works — but not everyone can tolerate it. Here's what the evidence actually says about bakuchiol and other alternatives, and who should consider switching.

Vitamin C is one of the most researched skincare ingredients — and also one of the most confusing to shop for. Here's how to actually choose one that works.

Niacinamide gets recommended for almost everything — but what does it actually do, and at what concentration? Here's the evidence, without the hype.

Not all skincare ingredients are created equal — some are recognized by your skin, others aren't. Here's what "skin-identical" actually means, and why it matters for anyone with sensitive or reactive skin.