Straight answers to the questions buyers and researchers ask most often.
What does “research use only” mean?
It means the product is sold for laboratory research and is not approved, labeled, or intended for human consumption or therapeutic use. Buyers are responsible for compliance with local law.
Why do prices for the same peptide differ so much?
Differences come from purity grade, lot documentation, synthesis scale, salt form, packaging quality, and supplier overhead. An unusually low price usually reflects missing testing or lower purity rather than a genuine bargain.
What is the difference between the acetate salt and free base?
Many peptides are supplied as an acetate or hydrochloride salt for stability. The salt adds molecular weight, so compare “peptide content” and price per milligram of active sequence, not total vial weight alone.
How do I read a certificate of analysis?
Check the lot number matches your vial, then review purity (HPLC), identity (MS), appearance, and any residual solvent or endotoxin figures. A CoA without a lot number or analytical trace is not meaningful.
Can I mix peptides in one vial?
Pre-formulated blends are convenient but verify each component’s dose. For custom combinations, researchers usually reconstitute separately and combine at the time of use to preserve stability and dosing accuracy.
How should I choose between suppliers?
Weight documentation and reliability above headline price. Use this directory to compare location, shipping reach, certifications (CoA, HPLC, third-party testing), lead time, and verified ratings side by side.