100% RDA.: FDA official guidelines http://www.fda.gov/food/guidanceregulation/guidancedocumentsregulatoryinformation/labelingnutrition/ucm064928.htm Note, B vitamins are water soluble and overdoses of them are probably impossible. Niacin, however at 500 mg amts is associatted with unpleasant flushing feeling in MOST people who take it.
Answered 8/17/2014
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