Mireille Tan

I spent six years on the other side of the beauty counter — first training sales staff, then assisting a small-batch formulator — which is mostly where I learned how much of a $90 serum’s price is the bottle.

At SerumSavvy I read the full ingredient list before the marketing copy, check what the evidence for the hero ingredient actually says, and work out cost per use from the real amount you apply. Devices get the same treatment: what the clinical claims were measured on, and what the replacement heads cost in year two.

I’m not a dermatologist. If something stings, flares or worries you, see one.