Wash face with a gentle cleanser, pat dry, and apply a few drops of TruSkin Vitamin C Serum. If using toner, apply toner before Vitamin C Serum. Apply your favorite moisturizer after the Serum dries.This is a CONCENTRATED and POWERFUL facial serum. As with any skincare product, we suggest doing a 24-48 hour Patch Test on a small area of skin on your neck or arm to make sure the formula is a good fit for you. If the serum is compatible with your skin, start by applying 3-5 drops of TruSkin Vitamin C-Serum followed by your moisturizer once daily.