Sunscreen can expire and its efficacy diminishes over time due to factors like UV exposure, air, heat, and hydrolization. Chemical sunscreens have a shorter shelf life, typically lasting one to two years after opening, compared to two to three years for unopened physical sunscreens. Proper storage and checking expiration dates are crucial to ensure protection from harmful UV rays. Dermatologist Dr. Maya Thosani explains how ingredients in both types can break down and affect performance if not properly maintained.
Does sunscreen expire? Yes, it does. Chemical and physical sunscreens both go bad over time. Chemical sunscreens typically last a year or two after opening, while physical sunblocks have a shelf life of two to three years when unopened.
Chemical sunscreens contain compounds like avobenzone, oxybenzone, and octinoxate, which can break down through UV exposure, air or heat, and hydrolysis. Physical sunscreens, such as those with zinc oxide, can break down by separating.
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