Take the supplement of the astronauts

Apparently all astronauts from all countries take Vitamin D
Some astronauts also take
   Magnesium, Vitamin K for bones (in addition to Vitamin D)
   Vitamin B-12, Folate for vision ( in addition to vitamin D )

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See also VitaminDWiki

• The only supplement NASA gives crews is vitamin D - Sept 2015
• Additional NASA and Vitamin D

Other than NASA

• Military and Vitamin D - many studies
• Olympic Committee consensus on Vitamin D, Omega-3, Zinc, etc– May 2018
  • Olympics committee finally approved vitamin D (Vit D and UV has been used in Olympics since the 1940s)
• Lack of Vitamin D Can Sideline College Football Players – Jan 2018
• NHL discovers Vitamin D – their ideal is 40-120 ng – 2016
• Elite Athletes Try a New Training Tactic: More Vitamin D - WSJ Jan 2016
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