The evidence, explained.

Your skin isn't sterile — it hosts its own ecosystem of bacteria that plays a real role in barrier health, inflammation, and breakouts. Here's what disrupts it, and what the evidence says helps restore it.

Sensitive skin isn't a diagnosis — it's a barrier condition. Here's how to identify your specific triggers and build a routine that supports skin instead of provoking it.

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

Tight, flaky, reactive skin is usually a barrier problem, not a hydration problem. Here's how to tell the difference — and the repair routine that actually works.

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.