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Description
TB-500, KPV, GHK-Cu, and AOD-9604 are not FDA-approved for human use in any form

For a more detailed look at peptide safety across compounds, review our safety guide

Reduced BDNF signaling may accelerate the degeneration of these neurons and impair the compensatory mechanisms that maintain motor function in early disease

However, all safety data comes from a single lab, no long-term studies exist, and the FDA cited specific safety concerns (immunogenicity, aggregation, impurities) in its 2023 ban
