zinc thymulin ghk-cu HAIRgevityPro™ – Healthgevity GHK-Cu Copper Tripeptide-1 | Research

But it came with what researchers call "retinoid dermatitis": inflammation mediated by MCP-1 and IL-8 cytokine release, barrier disruption from transepidermal water loss, and photosensitivity from exposing fresh, immature cells to UV

Lee E, et al

While not really used in the medical world anymore, there is evidence that topical BPC 157 does in fact work

The authors reported that intra-articular AOD-9604 injection in the rabbit osteoarthritis model produced macroscopic, histologic, and biomechanical evidence of cartilage preservation relative to untreated controls, with the combination of AOD-9604 plus hyaluronic acid yielding the most consistent chondroprotective effect [4]