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  • The RDA of folic acid and vitamin B12 should be sufficient to meet the body's requirement. Insufficient data exist to recommend otherwise.

  • Further studies should be done to determine the effects on vitamin status of long-term exposure to living and working in the heat.

  • During acclimatization, vitamin C intake should be about 250 mg per day to reduce heat stress and enhance acclimatization in those people who have adequate but low vitamin C status. Further study is warranted to confirm this recommendation and to determine whether supplementation may be effective in reducing heat stress in people with optimal vitamin C status.

  • Existing data show that vitamin C supplements may be needed for extended periods of living and working in hot environments. Further studies are needed to confirm this finding and to determine the amount of vitamin C needed to prevent a decrease in status.

  • There is no need to supplement vitamin D in hot environments.

  • Vitamin A (beta-carotene), vitamin C, and vitamin E function as antioxidants and may be useful as supplements in a hot environment. Further research is needed for confirmation.


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