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Sandra Allonen, registered dietitian, Beth Israel Deaconess Medical Center.
Aoi, M. Stem Cells Translational Medicine, June 18, 2012.
Whitney Bowe, MD, board-certified dermatologist; clinical assistant professor of dermatology at Mt. Sinai Medical Center.
CosmeticsInfo.org: "Panthenol and Pantothenic Acid."
Hossein, N. Journal of Medicinal Plants Research, May 17, 2013.
Iowa State University: "Protein."
Kelly, G. Alternative Medicine Review, 2011.
Linus Pauling Institute, Oregon State University: "Biotin."
National Institutes of Health Office of Dietary Supplements: "Zinc."
Julie Negrin, MS, CN, nutritionist, speaker, and author of "How to Teach Cooking to Kids."
Ordon, A. MD, Better in 7: The Ultlimate 7-Day Guide to a Better You, 2013.
The Merck Manual Home Edition: "Vitamin A."
Ohio State University: "Vitamin A (Retinol)."
The Vegetarian Resource Group: "Iron in the Vegan Diet."
USDA National Nutrient Database.
Reviewed by Stephanie S. Gardner, MD on February 28, 2019
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