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This is probably the most well-studied peptide combination in skincare

BPC-157 Angiogenesis Seiwerth et al

BPC-157 (pentadecapeptide, MW ~1400 Da), Cerebrolysin (peptide mixture, varying sizes), GHK-Cu (tripeptide-copper complex, MW ~400 Da), Thymosin Beta-4 (43 amino acids, MW ~5000 Da)

SeekPeptides recommends tracking the following data points for every injection

The primary analysis was based on the dose assigned at randomization (planned treatment) and included data censored for COVID-19-related discontinuations, while a sensitivity analysis used the actual maintenance dose received (actual treatment) with on-treatment data only