Sourcing Guide
Six analytical checks, three compliance signals and three practical ones, each answerable from a supplier's public pages before you order
In 2026 choosing a research peptide supplier stopped being only a question of price. The FDA sent warning letters to research-peptide websites and held a public advisory hearing on peptide compounding, and a lab that picked the wrong supplier put both its data and its supply at risk. This is the checklist we would use ourselves, written for that year. For the shorter nine-point version, see how to choose a peptide supplier in the US.
Eppix Labs supplies peptides for laboratory research use only. Nothing below is dosing, medical or legal guidance.
Score each criterion yes or no, with a note on where you found the answer:
We built eppixlabs.com around this checklist, and each point below can be checked on the site itself:
What is the single most important thing to check?
A batch-specific, independently verifiable certificate that matches your vial.
Are cheaper suppliers always worse?
Not always, but price cannot be judged without the analytical data. Compare cost per verified milligram.
Should I avoid suppliers that sell injection supplies?
The FDA has cited the sale of injection supplies alongside peptides as evidence of human-use intent. It is a meaningful compliance signal.
This article summarizes published preclinical research literature. Compounds referenced are supplied by Eppix Labs strictly as research materials for laboratory investigation within the United States. They are not approved by the FDA for human or veterinary use, and nothing on this page should be interpreted as medical advice or guidance on human or animal administration.
