Source: UC Berkeley Wellness Letter
Summary:
If you are active in sports and exercise, even a small deficiency in B vitamins can impair performance, per a report in Int. J. Sports Nutr. & Ex. Metab.
Those who restrict calories or avoid some food groups are more susceptible to deficiency
Most multivitamins provide 100% of the RDA for B vitamins
Conclusion: Sufficient B vitamins are necessary for athletic and exercise performance
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