Is Retisol A (Vitamin A) Dangerous to Health?

Ive only heard great things about retisol a/ retin a and now I am scared to continue using it as I've heard that it can cause problems with eye sight and it actually thins you skin. It was stated on a website that the only reason wrinkles go away is because it swells your skin. I've also read stories where it effects people's vit D levels. The list goes on.. I'm just wondering is it really safe to use? Also Is it bad to use for long periods of time.

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