Sunscreen is the number one product to protect your skin from the aging process.
To date, there is not a criteria in the United States for measuring and labeling the amount of UVA defense that a sunscreen provides. The FDA, however, plans to introduce UVA standards within the next few years.
They would demand that manufacturers assess the sunscreen's ability to screen out UVA with a series of tests, then be given a 1 to 4 star rating; 1 indicating the lowest and 4 the highest among of UVA protection. Any manufacturer that does not meet the minimum requirements would have to label their products "no UVA protection."
In the meantime, for your skin's sake and safety, wear an SPF of at least 15 or higher everyday to protect yourself against UVB. And always be aware that no matter what sunscreen you use, some UV radiation will always get through to your skin. This is why you should still take precautionary measures like seeking out shade and wearing protective clothing.
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