Sunscreens of previous generations contained the ingredient PABA, which could indeed cause poisoning. However, modern sunscreens do not contain toxic or poisonous components. It’s likely that any sunscreen (even if it’s not a lip balm!) will mix with sweat/sebum and end up in your mouth, with some amount entering your digestive tract. This is not harmful.
Moreover, sunscreens are absorbed into our bloodstream, which scientists are aware of – and even this is not a cause for concern.
What we do know for sure is that UV radiation is harmful, and using sunscreens protects us from its effects (including cancer). So, don’t worry and apply sunscreen liberally for your health and safety!
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