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I've looked, and I can't find consistent documentation about which independent labs they use, if any

This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition

For further reading on peptide pharmacokinetics, researchers may consult the PubMed database for peer-reviewed studies on peptide half-life and plasma clearance, the FDA Drugs database for approved peptide therapeutics and their pharmacokinetic profiles, and the NIH review on peptide stability for a comprehensive overview of factors that influence peptide degradation in biological systems

Every batch is HPLC-tested to confirm a purity of 99%