Physical sunscreen

Physical sunscreens have active mineral elements found on Earth, ZINC OXIDE and TITANIUM OXIDE which act as scatterers or reflectors of UV light as a mirror, forming barrier on the skin, shielding you from both UVB rays, which cause sunburn, and UVA rays, which penetrate more deeply and may be more dangerous causing early aging, hyper pigmentation & risks of skin cancer.

The SPF of the sunscreen does not measure its protection against UVA rays— only UVB rays. It is a measurement of the difference between the amount of sunlight that causes redness in sunscreen-protected skin and the amount that causes redness in unprotected skin.

A sunscreen with a SPF of 15 conceptually gives you 15 times the minutes to stay out before your skin starts burning.

Example: if you usually burn in 10 minutes, and you apply SPF 15 lotion, you can stay out for 150 minutes.

Some problems with this equation is that it makes people believe a SPF of 30 would allow them to remain twice as long in the sun as SPF 15. Infact a SPF 15 blocks about 93% of UVB rays, while an SPF 30 blocks about 97%, and an SPF 50 about 98%. So going higher in SPF doesn’t provide more protection after a certain point.

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