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Pairing topical GHK-Cu with scalp microneedling improves penetration and adds an independent growth stimulus

[1] These reactions usually improve after the initial 2 weeks of therapy

doi: 10.3389/fendo.2026.1709556 Received 23 September 2025 Revised 15 January 2026 Accepted 26 January 2026 Published 11 February 2026 Volume 17 - 2026 Edited by Abdel Halim Harrath, King Saud University, Saudi Arabia Reviewed by Aldo Ferreira-Hermosillo, Mexican Social Security Institute, Mexico Raquel Evelyn Horowitz, Montefiore Medical Center, United States Updates Copyright 2026 Wang, Chen, Wang, Song and Zhang

GHRP-2: D-Ala-D-Nal-Ala-Trp-D-Phe-Lys-NH GHRP-6: His-D-Trp-Ala-Trp-D-Phe-Lys-NH For the full individual profiles, see our GHRP-2 Dosing Guide and GHRP-6 Complete Guide

Journal of Neuroimmunology