+99% Verified Purity. Every Batch. Every Time.

All Peptide Nexus Lab products meet or exceed ≥99% purity as confirmed by independent HPLC analysis. Each batch is also verified by mass spectrometry to confirm molecular identity, with results published on the batch-specific Certificate of Analysis.

Yes, without exception. Every order ships with a downloadable COA from an independent, accredited third-party laboratory specific to that production batch. You can also search any batch ID in our COA Library to verify results before or after purchase.

We use High-Performance Liquid Chromatography (HPLC) to verify purity and Mass Spectrometry (MS) to confirm molecular weight and sequence identity. Endotoxin and sterility screening is also performed on every batch before release.

Orders placed before 2 PM are dispatched the same business day from our U.S. facility. All shipments are packed in discreet, temperature-controlled packaging with full tracking provided to your email.

Yes — orders over $200 qualify for free same-day shipping within the USA. Smaller orders are calculated at checkout based on weight and destination.

If a product does not meet the purity stated on its COA, we offer a full replacement or refund. Unopened items in original condition are also covered by our 30-day return policy. Contact us within 5 business days for any transit damage or dispatch errors.

Lyophilized (freeze-dried) peptides should be stored at −20°C, where sealed vials remain stable for up to 24 months. Once reconstituted with bacteriostatic water, store at 2–8°C and use within 2–4 weeks. Always protect from light and avoid repeated freeze-thaw cycles.

Allow the vial to reach room temperature, then slowly add bacteriostatic water along the inside wall of the vial — never directly onto the powder. Gently swirl (do not shake) until fully dissolved. Reconstitution volumes and storage guidance are listed on each product page.

Divide total peptide mass by the volume of bacteriostatic water added (e.g. 5mg ÷ 2ml = 2.5mg/ml). For a target amount, divide that figure by the concentration to get the draw volume in ml, then convert to units on a standard insulin syringe. Our support team can assist with unit conversions for your specific protocol.

Research peptides are sold as laboratory research chemicals, distinct from pharmaceutical drugs, and are legal to purchase for legitimate in-vitro research in most jurisdictions. Legality varies by compound, country, and intended use — it is the buyer’s responsibility to confirm compliance with local laws. All products from Peptide Nexus Lab are sold strictly for research purposes and are not intended for human or veterinary use.