Skincare with the numbers on the front.
Every Assay bottle prints its active, its strength and its pH where you can see them, so you know what you’re putting on your face and what not to mix it with.
- 11 formulas
- 0 fragrance
- $14 to start
How to read an Assay label
Four things on the front of every bottle, in the same place every time. No marketing words, no hidden percentages.
- 1
The strength
The biggest thing on the bottle. 15% means 15% of what’s inside is vitamin C.
- 2
The active
The one ingredient doing the work, named the way a dermatologist would say it.
- 3
The pH
Acids and vitamin C need a low pH to work. It also tells you what will sting together.
- 4
The strip
The color says the step: blue cleanses, violet treats, pink exfoliates, green moisturizes, gold protects.
The ones people come back for
Shop all 11Can I use retinol and vitamin C together?
Yes, just not in the same routine. Tell the checker what’s on your shelf and it lays out your morning and night, and which nights to swap.
Check my routineSplit them
- Morning: vitamin C, then sunscreen
- Night: retinol, then cream
Four steps. Shop by the one you need.
What it feels like
- Free shipping over $45 Ships from L.A. in 1 to 2 days
- 30-day returns Even on opened bottles
- No fragrance And never tested on animals