How much sunscreen should I apply to my face?

Dermatologists recommend approximately 1/4 teaspoon (or a nickel sized amount) for the face and neck. Most people apply only 25 50% of the recommended amount, which dramatically reduces the effective SPF an SPF 50 applied at half thickness delivers roughly SPF 7. Reapply every two hours during continuous sun exposure, or immediately after swimming, sweating, or toweling off.