Vitamin D

Vitamin D Dilemma. Our skin uses small amounts of natural ultraviolet radiation to manufacture vitamin D, which — like calcium — is vital to maintaining healthy bones. About 10 minutes of Sun each day allows our skin to make the recommended amount of vitamin D. To work outside in the space environment, astronauts have to wear space suits which shield them from ultraviolet radiation. So because astronauts cannot produce vitamin D naturally from sun exposure, they take supplements to help with this issue."Do ISS astronauts occasionally let the sunshine in for a natural light "fix"? | Asked 6 years ago | Modified 4 years, 9 months ago | Viewed 4k times" | space.stackexchange.com
-- Effects of Space on the Human Body 
Presentations: These are intended to provide background information for program providers, and not to be used directly in youth programs. These external resources are not necessarily 508 compliant.Effects of Space on the Human Body (usra.edu)
----