Health
Some sunscreen mixtures lose effectiveness and become harmful during sun exposure – Newswise
During use some sunscreens offer very limited protection against dangerous sunrays and may even be harmful.

Newswise — During use some sunscreens offer very limited protection against dangerous sunrays and may even be harmful.
Chemical reactions involving a main ingredient – zinc oxide – mean many sunscreens become ineffective after just two hours of sun exposure,…
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