Each evening, apply on to a cotton pad, then sweep across the face and neck, avoiding the eye and lip area. Allow 2-3 minutes for the formula to work at its optimum pH before applying any additional steps.
If your skin is not used to acids, you should introduce this slowly to minimise 'purging' of the skin (where it gets worse before it gets better). If you start with using this 1-2x/week and build up to each evening over the course of 2-4 weeks you should give your skin appropriate time to adjust to the formula.