There is no known toxicity level for pantothenic acid in humans, but gastrointestinal side effects such as nausea and heartburn have been reported in doses up to 1,200 mg.How much does a child need?The U.S. Food and Nutrition Board of the National Academy of Science's Institute of Medicine makes the following recommendations for daily AI:infants from birth to six months: 1.7 mginfants from seven m