This is complex to evaluate. Another issue is that absorbing UV to create Vitamin D happens not within the body but at the skin. Because of this washing and s

This is complex to evaluate. Another issue is that absorbing UV to create Vitamin D happens not within the body but at the skin. Because of this washing and scrubbing thoroughly just after sun exposure can reduce or eliminate generation of Vitamin D. What is considered ideal is to get sun exposure during the day and then avoid showering until the next morning to allow the skin to do its work.