GHK-Cu (copper peptide) is widely considered the best overall peptide for hair growth due to its multi-pathway mechanism, strong research backing, versatile application methods (topical and injectable), and excellent safety profile
If a peptide reaches the 503A Bulks List after PCAC recommendation and FDA rulemaking, 503A pharmacies may compound it under patient-specific prescription
Small Fiber Neuropathy Small fiber neuropathy involves damage to unmyelinated nerve fibers responsible for pain, temperature, and autonomic function
( Mount Sinai Health Library
If you're new to this whole category of ingredients, you can get up to speed on how they work in our detailed guide on peptide serums
BPC-157 that had no effect on thermal hyperalgesia or tactile allodynia