Good Genes All-in-One Lactic Acid Treatment Face Serum

This is a lactic acid treatment you leave on — not a mask you rinse off. You apply 1 to 3 pumps on clean skin, day or night, and it sits there doing its thing. Lactic acid is gentler than glycolic acid but still exfoliates dead skin. If someone already uses actives and knows their skin tolerates acids, this slots right in. If they're new to chemical exfoliants, this might be too strong to start with. It comes in four sizes, from a 15 mL tester up to a 100 mL bottle. The price jumps with size, so pick based on whether this is a trial or a refill for someone who already uses it.