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FDA guidance on sunscreen

FDA public page on how to use sunscreen and what SPF and broad spectrum mean.

2 links, 2 backed by primary records

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Proof 3 sources

Sunscreen: How to Help Protect Your Skin from the Sun, U.S. Food and Drug Administration. Primary record
All sunscreens must be tested to measure the amount of ultraviolet (UV) radiation exposure it takes to cause sunburn when using the sunscreen compared to how much UV exposure it takes to cause a sunburn when not using the sunscreen.
A sunscreen product’s SPF value is primarily an indicator of the level of protection that product provides against UVB radiation, but broad-spectrum sunscreens also protect against UVA radiation.
Reapply sunscreen at least every two hours, and more often if you're sweating or swimming.
SPF is not directly related to time of solar exposure but to amount of solar exposure.
To get the most protection out of sunscreen, choose a broad-spectrum sunscreen with an SPF of at least 15.
Prohibited & Restricted Ingredients in Cosmetics, U.S. Food and Drug Administration. Primary record
Use of the term "sunscreen" or similar sun protection wording in a product's labeling generally causes the product to be subject to regulation as a drug or a drug/cosmetic, depending on the claims.
Frequently Asked Questions on Benzene Contamination in Drugs, U.S. Food and Drug Administration. Primary record
FDA recommends consumers use broad spectrum sunscreens with SPF values of at least 15, which have been shown to reduce the risk of skin cancer and early skin aging when used with other sun protection measures.

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