The 7-Question Tesamorelin Supplier Checklist
The single most important question to ask any Tesamorelin supplier is whether they provide third-party HPLC and Mass Spec reports with every batch. Without independent verification, you’re trusting the supplier’s word on purity — and in peptide research, that’s a gamble you can’t afford.
After sourcing research peptides for several years, I’ve developed a straightforward verification process that catches most unreliable suppliers before any money changes hands.
Question 1: Can you provide a third-party COA?
A Certificate of Analysis from an independent lab carries far more weight than an in-house report. In-house COAs are common but only as reliable as the supplier’s own quality control process.
Question 2: What’s your synthesis method?
Solid-phase peptide synthesis (SPPS) is the gold standard for research peptides. Ask specifically about their purification method (HPLC is standard, ion-exchange is cheaper but less precise).
Question 3: How do you package for international shipping?
Lyophilized peptides should be vacuum-sealed in glass vials with inert gas. Plastic containers or loose packaging indicate cost-cutting that compromises product stability during transit.
Questions 4-7: The Quick Hits
- Lead time: How long from payment to shipment? (3-7 days is normal for stock)
- Reship policy: What happens if a package is seized or damaged? (Legitimate suppliers reship)
- Physical address: Do they have a verifiable business location? (Google it)
- References: Can they connect you with existing lab customers?
FAQ
How can I tell if a COA is legitimate?
Contact the testing lab directly to verify the report number. Any legitimate lab will confirm whether they produced a given report. If the supplier won’t tell you which lab did the testing, walk away.
Should I order a sample before bulk?
Yes — always order 1-5 vials as a test batch before committing to 100+ units. Test the purity independently and verify the supplier’s shipping reliability on a small order first.
When evaluating peptide suppliers, documentation matters as much as pricing. Ask for batch-specific reports before ordering.