Sunscreen Basics: SPF, Broad Spectrum, Amount, and Reapplication
Sunscreen is easier to choose when you focus on protection, adequate application, and practical use. The most elaborate filter debate is less useful than a product you can apply thoroughly.
Read the protection label
Choose broad-spectrum SPF 30 or higher. Broad spectrum addresses UVA as well as UVB protection; SPF primarily describes protection against sunburn under test conditions. SPF is not a timer telling you how long to stay outside.
Water resistance is labeled for a specified period, commonly 40 or 80 minutes in the United States. It does not mean waterproof. Country-specific labels and formulations differ, so verify the exact product rather than assuming similarly named versions are identical.
Apply enough and cover evenly
Follow the label, apply before exposure, and cover all exposed areas. Most adults need roughly an ounce for exposed body skin, with the actual amount depending on the area covered. Include ears, neck, hands, and an exposed scalp, or cover them with appropriate clothing.
A sunscreen moisturizer can work if you use an adequate amount. A thin cosmetic layer may not supply the labeled protection. Do not dilute sunscreen with lotion or foundation.
Reapply for the situation
During outdoor exposure, reapply about every two hours and after swimming or sweating according to the water-resistance label. Toweling can remove product too. This advice does not mean every sunscreen molecule suddenly stops working at two hours; coverage changes during real use.
Skip the false choices
Mineral and organic UV filters both protect by interacting with UV radiation; the familiar “mineral reflects, chemical absorbs” explanation is oversimplified. Choose for protection and tolerability. A white cast, finish, fragrance, or eye sting can affect whether you use a product consistently.
“Reef-safe” is not a universal, standardized guarantee. Check local rules and avoid interpreting the phrase as proof of no environmental effect. Indoor decisions depend on actual exposure, including time near windows, rather than an identical rule for every room.
Pair sunscreen with shade and protective clothing. No sunscreen blocks every UV ray, and no perfect label can compensate for barely applying it.
Sources: AAD sunscreen FAQs; AAD understanding sunscreen labels.
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