My aunt had a vitamin D deficiency and her doctor told her to sunbathe nude at noon every day, in her backyard, for 15 minutes or she would have bad things happen to her kidneys. Right about that time, she started getting asked on more dates from the neighborhood widowers than she had gotten since her divorce 20 years before. Now she has a very sweet boyfriend and they expect to get married in the next couple of years. So vitamin D is very important.