Abstract
Linear nail growth rate is affected by various conditions, one of which is the level of blood flow. Our supposition was that topical minoxidil, which has vasodilatory properties, can increase the rate of nail growth. The aim of this study was to determine the impact of topical minoxidil on nail growth. A 5% topical minoxidil solution was applied twice daily to the fingernails of 32 participants. Two groups of 16 participants were randomly chosen. In one group, the applications were made to the right index and left ring fingernails, and, in the other, the left index and right ring fingernails. During each visit (weekly during the first month and every 2 weeks during the second month), the nail length of six fingernails (index, middle, and ring of both hands) was measured using a digital caliper. Beginning in the first week, the mean nail length of the treated nails was greater than that of nails in the untreated group with statistical significance. There were no systemic or cutaneous side effects. During the first month, the mean growth of the treated nails was 4.27 mm/month compared with 3.91 mm/month in the untreated nails (P = 0.003). These findings suggest that a 5% concentration of topical minoxidil can stimulate nail growth with increased growth beginning in the first week of application. The results may have important implications for the treatment of nail disorders; however, a comparable study involving participants with nail disorders is highly recommended.
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