·3 min read·routine
Skincare routine order — the rule that actually matters
Most layering 'rules' online are made up. There's only one principle that actually changes how products work, and it's about texture, not pH.
·3 min read·retinol
How slowly should you start retinol? A week-by-week plan.
'Start slow' is everywhere; 'how slow' is never specified. Here's the schedule that gets you to nightly retinol in 12 weeks without trashing your barrier.
·3 min read·ingredients
Can you use niacinamide and vitamin C together?
Yes, you can — and the old myth that they cancel each other out comes from a 1960s study using a form of vitamin C nobody uses anymore. Here's what the actual chemistry says.