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FAQ

Questions? Check below – we’ve answered the most common ones.

Shipping Info

Once we receive your order, it’ll be processed within 24-48 hours and shipped via USPS or UPS within the U.S. Tracking numbers may take up to 24 hours to update. Orders placed on weekends will ship the following week. If your order arrives damaged please contact us within 2 days and include a photograph so we can issue a replacement.

Refund Policy

We do not accept returns. If you have concerns about the integrity of your order, please reach out to us at support@peptidesxpress.com

Other Common Questions

Are PepXpress peptides third-party tested?

Yes. Every peptide sold by PepXpress undergoes independent third-party testing by ISO-accredited laboratories in the United States. We verify the identity, purity, potency, and endotoxin levels of each batch to ensure the highest research-grade quality. Certificates of Analysis (COAs) and supporting lab reports are published with every product so you can review the exact data before purchasing.

What is the purity level of PepXpress peptides?

PepXpress peptides are synthesized and purified to ≥99% purity (often 99.5%+ as confirmed by HPLC). We reject any batch that does not meet our strict internal specifications. This guarantees reproducible, high-integrity results for your research protocols.

How do you ensure consistency from batch to batch?

We work exclusively with long-term, vetted synthesis partners using validated SOPs. Every new batch is compared against previous reference standards, and we only release products that fall within our tight acceptance criteria. This minimizes variability so your experiments remain reproducible over time.

What does “for research use only” mean?

“For research use only” indicates that the peptides sold by PepXpress are not drugs or supplements and are not intended to diagnose, treat, or prevent any disease. They are meant exclusively for in vitro studies or preclinical lab work by professionals.

Where can I view the Certificates of Analysis (COAs)?

All current-batch COAs are directly linked on each product page under the “COA” tab. If you’re looking for an older batch or need additional documentation, simply contact our research support team at support@pepxpress.com and we’ll provide it within 24 hours.