How much sunscreen should be applied daily?

Recent studies have shown that most people apply only 25-50% of the recommended amount of sunscreen. The American Academy of Dermatology recommends to use a sunscreen that offers Broad-spectrum protection protects against UVA and UVB sunlight), an SPF greater than 30, and is water resistant. The recommended amount is one ounce, which is enough to fill a shot glass. Apply the sunscreen to dry skin 15 minutes prior to sun exposure. Don’t forget to apply sunscreen to your ears and lips and to reapply every two hours or after swimming or excessive sweating.