Obagi Professional-C 10% Serum 30ml

10% vitamin C serum, the gentler entry strength. A good fit for dry or more sensitive skin, and the right place to start if you have never used an L-ascorbic acid serum, because the commonest reason people give up on vitamin C is starting too strong.

Apply four to five drops to clean, dry skin in the morning, before moisturiser and sunscreen. Vitamin C and daily SPF work together: the serum limits the damage, the sunscreen prevents it. Expect a slow brightening over eight to twelve weeks rather than an overnight change. L-ascorbic acid oxidises, so keep the bottle closed and out of direct light, and accept that it will darken slightly over its life.