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Why it's #1: GHK-Cu has the most evidence, works through multiple mechanisms, and has the longest track record of success for hair loss specifically

Variability in outcomes across studies can be attributed to a range of factors, including demographic, genetic, and environmental differences, as highlighted by various studies [16,17]

Furthermore, the inhibition of proteolytic enzymes was suggested to promote the activation of apoptotic events in MCF-7 breast cancer cells (228)

furthermore, the S2-only vaccine was shown to induce nAb to both - and - coronaviruses (presumably to the fusion peptide as has been described in humans [69]), and it boosted a more broadly targeting antibody response overall than repeated homologous full-length spike vaccines [73]

M., Kumar, G., Shipper, A

And once you understand the actual physiology, you can stop blaming yourself and start addressing the real mechanisms