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Human-grade peptides are sourced from licensed compounding pharmacies that follow pharmaceutical manufacturing standards, while research-grade peptides are labeled "not for human use" and are not subject to the same quality controls
Personal Opinion: Having worked with multiple peptide suppliers over the years, I find that the companies willing to share detailed COA documentation tend to be the ones producing consistently reliable products
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Other peptides function much like hormones, acting at cell-surface receptors, while others enter cells and bind to intracellular proteins
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