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Since the sun is the primary cause of skin wrinkling, it is best to protect the skin from UVB (causes sunburn) and UVA (causes skin cancer) rays. It is important that sunscreens have both UVA and UVB protection, provided only by avobenzone (Parsol 1789), titanium dioxide, or zinc oxide. Avobenzone is better for oily skin because it is not as thick but it can cause skin irritation. Titanium dioxide or zinc oxide are completely non-irritating but pose a problem for oily or acne prone skin because their occlusive composition can clog pores. Sunscreen products usually have a shelf life of only two years. Few products indicate this important information on their labels. The date of manufacture is found on our SPF 15 Daily Shade Formula.