There are some things that will speed up the expiration process of your sunscreen. First, you’ll want to make sure you store your sunscreen in a dark place away from sunlight. Excessive heat can cause the actives in the sunscreen to break down. So when you take your SPF to the beach, try wrapping it in a towel or keeping it in your chilly bin.
And, always check the use-by date because they’re not as effective past that date.