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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