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Publication bias is a specific concern in this field: the commercial interest in positive peptide hair results is high, and there is no documented collection of null or negative results for hair peptides to establish the true proportion of successful versus unsuccessful studies

Concentrated solutions (10 mg/mL) require smaller injection volumes, which can be challenging to measure accurately with standard syringes

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doi: 10.3389/fendo.2026.1822475 Received 03 March 2026 Revised 05 May 2026 Accepted 02 June 2026 Published 18 June 2026 Volume 17 - 2026 Edited by Carmine Bruno, Link Campus University, Italy Reviewed by Matej Rakusa, University Medical Centre Ljubljana, Slovenia Fredrik Tiberg, Camurus AB, Sweden Updates Copyright 2026 Dominikowski, Rko, Olejarz, Szczepanek-Parulska, Domin and Ruchaa

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