ghk-cu hair growth clinical study microneedling + Topical Treatment Meta-Analysis (2024) — Research Summary How Often to Inject GHK-Cu
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It can take months depending on how much damage has been done

Sirugo G, Williams SM, Tishkoff SA

Compound Deep Dive: BPC-157, TB-500, and GHK-Cu BPC-157 and TB-500 is a common pair for tissue repair and recovery

Helander IM, Nurmiaho-Lassila EL, Ahvenainen R et al (2001) Chitosan disrupts the barrier properties of the outer membrane of Gram-negative bacteria

The other is by helping your body process and break down stored fat