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Unknown purity and identity Peptides from unregulated sources may contain: Incorrect amino acid sequence Truncated peptides Impurities from incomplete synthesis Other peptides entirely Particulate matter from resin or filters Independent labs have repeatedly shown that many online peptides are mislabeled or impure

To be fair, many common supplements like protein powders, collagen, creatine, melatonin, vitamin D, and turmeric are also not FDA-approved

10.1186/s13018-019-1242-6 86 PetekM.SikiricP.AnicT.BuljatG.SeparovicJ.Stancic-RokotovD.et al (1999)

More recent research has explored BPC-157s effects on dopaminergic and serotonergic systems, traumatic brain injury models, and neuroprotection