At night, after cleansing, apply 2–3 drops of Refirm Serum to the face, neck and décolleté and allow to absorb. Massage 1–2 pumps of the Aging Reversal Neck Serum into the neck and décolleté, then follow with your moisturiser. Always apply a broad-spectrum SPF in the morning. Important: Refirm Serum should not be used together with any Vitamin C products.