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"Topical niacinamide does not stimulate hair growth based on the existing body of evidence - John E. Oblong Andrew W. Peplow Scott M. Hartman Michael G. Davis
This letter is intended to clarify misconceptions in the consumer world on the alleged side effects of niacinamide (Nam or nicotinamide) on hair growth properties. It is important that the overall body of evidence related to Nam and hair biology be reviewed so as not to confuse consumers and patients on Nam impact on facial and body hair. We have reviewed the published literature and provide new data to demonstrate that Nam has a neutral, if any, impact on hair growth properties."