Frequently Asked Questions
Are you a manufacturer or a reseller?
A manufacturer. Liyu Peptides is the global sales channel for Liyu Daily Peptide Factory (Liyu Co., Ltd), which has synthesised peptides for over 30 years and also produces for other brands. Liyu Co. serves China; we serve the rest of the world. There is no upstream supplier between the factory and the vial you receive – which is also why your certificate of analysis is issued in the factory’s name, Liyu Daily.
Who carries out your testing?
Janoshik Analytics is our go-to independent third-party laboratory in Prague, Czech Republic. It has no commercial relationship with us beyond being paid for the analysis. Released batches are tested using the methods appropriate to the compound and report, and Janoshik is named on every certificate it issues.
How do I verify Liyu Peptides COAs on Janoshik?
Open the Liyu Peptides COA verification hub, find the compound and batch, then use the direct Janoshik verification link where available. Each released report is tied to batch-specific testing rather than a generic sample document.
What does Janoshik testing confirm?
Janoshik testing can confirm analytical details such as measured purity, identity, composition, or content depending on the compound and report method. It does not turn a research-use compound into a medication or provide usage guidance.
What is your refund or reship policy?
We do not accept general returns. If an order arrives damaged, incorrect, lost, or appears not to match its posted COA or purity specification, contact us within 30 days and we will review it under our quality guarantee. See our Shipping & Returns Policy.
Why not test in-house? You have the equipment.
Because a purity figure produced by the company that made the product is a marketing claim, not a measurement. Independence is the entire value of a certificate. We pay for an unaffiliated laboratory in a different jurisdiction precisely so the number means something.
Where do you ship?
We offer tracked global shipping where carrier service, customs rules, sanctions screening and product-specific restrictions permit. Estimated delivery is 2–14 business days after dispatch. Russia is currently selectable. Mainland China, Hong Kong, Macau, Cuba, Iran, North Korea, Syria and Ukraine are not. Import rules for research chemicals vary and can change without notice, so confirming that import, possession and research use are lawful in your jurisdiction remains your responsibility. See our Shipping & Returns Policy.
How are products packaged?
Lyophilised powder in sealed vials, supplied in packs of ten. Each pack carries the batch code that links to its certificate of analysis.
Can you advise on dosing or administration?
No. These are research chemicals supplied for laboratory and in-vitro use only. They are not approved for human or veterinary use, and a supplier offering dosing guidance would be operating outside the terms under which these compounds can lawfully be sold.
Do you sell through Telegram, WhatsApp, or resellers?
No. Our only store is liyupeptides.com. Anyone contacting you on another platform claiming to represent us is not connected to this company – please report it to qa@liyupeptides.com.
Do you offer wholesale or private label?
Yes. We manufacture for other brands. For volume pricing, custom strengths, or private-label enquiries, contact wholesale@liyupeptides.com.