Every person has their own MED, minimal erythemal dose, which means how much times passes without the skin turning red from irritation. Everyone has different skin and different tolerance to the sun exposure and the results will vary from person to person. However, SPF 15 will provide a fairly high amount of protection, it blocks about 94% of UVB light, however, it does not guarantee the skin to be free from any sun damage. If you feel you need a higher SPF, visit a dermatologist so they can recommend you the correct protection. You do not want to buy a high SPF by yourself because the higher the SPF the more chemicals it contains.
The only FDA approved sunscreens are the broad spectrum sunscreens; they protect against UVA and UVB. A good broad spectrum sunscreen should contain titanium dioxide and zinc oxide.
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