https://pubmed.ncbi.nlm.nih.gov/30945275/

@jca2 hit the nail on the head.

Vitamin D is produced in your body by interaction with UV rays.

https://www.skincancer.org/blog/sun-protection-and-vitamin-d/

Interesting question. It asks about absorption of Vitamin D. Sunscreen will likely reduce some Vitamin D creation by your skin. But you can also take D3 supplements that could help regulate the D in your body and would bypass the sunscreen entirely.

@seawulf575 Yes, I have started taking D3 supplements for a deficiency; I was just curious about the other issue.

No, sunscreen will not block vitamin D. The benefits of using sunscreen far outweigh any misconception that sunscreen prevents vitamin D absorption. Also, as far as I know, if you have vitamin D insufficiency, most of it should come from food and food supplements anyway. Just the sun is not enough.