The standard is the product.

G1 peptides are compounded in FDA-registered US pharmacies. We do not sell imported bulk powders or products of unverifiable origin — each product traces to a named pharmacy with a documented chain of custody.

Purity is verified through third-party laboratory testing on a batch-by-batch basis. Products are released only when they meet the purity stated on the label.

Lyophilized peptides ship in pharmaceutical-grade glass vials; prefilled pens ship refrigerator-stable. Orders travel cold-chain from pharmacy to door so the product that arrives is the product that was tested.

G1 Peptides works with licensed medical providers. Prescription products are provided under their care, and a free telehealth consultation is available to anyone deciding where to start. Products are labeled for their intended route of use and should be used exactly as directed by your provider.

Quality concern with a specific order or batch? Contact us at support@g1peptides.com with your order number and lot information — it will be reviewed by the clinical team, not a ticket queue.