A research supplier built on documentation.

Pep Bros LLC is an Arizona-based supplier of research peptides for laboratory and in-vitro research. We built the company around one idea: a reagent is only as useful as the documentation behind it.

Our approach

Verifiable facts, nothing more.

Researchers need to know exactly what is in the vial. That is why every listing we publish is limited to verifiable chemical facts: sequence, molecular formula, molecular weight, purity method, salt form, solubility, and storage conditions.

Each lot is tested by an independent third-party analytical laboratory, and every vial is labeled with a lot number that links it to its Certificate of Analysis. If a lot does not meet specification, it is not sold.

How we operate

Three commitments

Documentation first

Every lot is independently tested, and its certificate is published before the lot goes on sale.

Strictly research use

We sell laboratory reagents only. We do not provide usage guidance, and we cancel orders that indicate human or veterinary use.

Factual support

Our team answers questions about chemical attributes, specifications, storage, and documentation.

Ready to review the catalog?

Review current lots, specifications, and certificates before you order.

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All products are sold strictly for laboratory research purposes only and are not for human or veterinary consumption. They are not drugs, foods, dietary supplements, or cosmetics. Statements on this website have not been evaluated by the U.S. Food and Drug Administration, and no product is intended to diagnose, treat, cure, mitigate, or prevent any disease. Pep Bros LLC is a supplier of research chemicals and is not a pharmacy, compounding pharmacy, or outsourcing facility. Purchasers must be 21 years of age or older and are responsible for safe handling and lawful use.

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