For a nightly treatment - add one drop and mix with your favorite serum. For a weekly potent mask - After cleansing, apply a thin layer to skin and wash off after 10 minutes. Avoid eye contact. This acid booster was designed to give you the freedom to integrate as you need it into your routine. Dilute with your hydrating serum or moisturizer for a nightly treatment or use once a week as a wash-off mask. Gold Standard is at your service!