Efficacy of 2.5mg oral biotin versus 5% topical minoxidil in increasing nail growth rate.

The fingernail growth rate (NGR) is approximately 3 mm/month and varies according to sex, age, labour activities, systemic diseases, seasonality, dominant hand, and trauma.1 The slow growth of nails may have functional and cosmetic impact, such as nail fragility and delayed renewal of the nail plate.2 Few studies have evaluated pharmacological interventions to increase NGR.