Some sunscreen products do not stamp an expiration date on the container. But, this doesn't mean you should throw out your sunscreen after every season. Unless there is an expiration date given, your bottle of sunscreen should be good for up to 3 years if it's kept at room temperature. However, the protective effects of the sunscreen may be reduced if it's repeatedly exposed to heat - a common occurrence when you leave your sunscreen out in the sun at the beach or in your golf bag during a round of 18. In my experience, most bottles of sunscreen do not last very long, if used properly. This means using sunscreen on exposed skin whenever you go outside, even on cloudy days. Damaging UV (ultraviolet) rays can penetrate clouds, so don't take a chance. You should apply sunscreen generously to exposed skin at least 20 minutes before you go outside. Use a sunscreen with a minimum SPF (sun protection factor) of 15 and make sure you're getting both UVA and UVB protection. Be sure that you reapply the sunscreen
on a regular basis throughout the day, every 2 hours or so, especially after swimming or sweating.
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