Sourcing
Where to source research peptides
Every number on this site assumes the vial contains what its label says. That makes the supplier the first step of any careful work. Here is what to check before you buy, and the supplier we recommend.
Peptide Knowledge is affiliated with IronCell Research, a supplier of research compounds, and benefits when readers buy from it. Keep that in mind when you read our recommendation below, and judge any supplier, including this one, by the checklist on this page.
What to look for in a supplier
- A certificate of analysis for your exact lot. The lot number on the certificate should match the lot number printed on the vial. A certificate for a different batch tells you nothing about yours.
- Identity and purity testing. Look for mass spectrometry to confirm the molecule and HPLC to report purity, with the chromatogram shown rather than a number alone.
- Testing by an independent lab. A report from a named third-party laboratory, with a test date, carries more weight than one produced by the seller.
- Net peptide content. Powder weight includes water and salts. Suppliers that report net peptide content let you calculate concentration accurately.
- Sealed, labeled, freeze-dried vials. Lyophilized powder in a sealed vial, labeled with the compound, amount in mg and lot number, is the stable format for shipping and storage.
- Careful shipping and storage guidance. Fast domestic shipping, protection from heat and clear storage instructions help material arrive in the condition it was tested in.
- Honest research-use labeling. Reputable research suppliers label products for laboratory use only and make no health claims.
Our guide to reading a certificate of analysis walks through each line of a lab report.
Red flags
- Promises of health effects, results or before-and-after photos
- Dosing instructions or protocols for people
- No certificate of analysis, or one with no lot number, lab name or date
- Prices far below every other supplier for the same compound
- No contact details, policies or business information
Our recommended supplier
Recommended · affiliated
IronCell Research
Disclosure: Peptide Knowledge is affiliated with IronCell Research, a supplier of research compounds, and benefits when readers buy from it.
According to its website, IronCell Research sells peptide vials, blends, oral capsules and lab supplies for laboratory research only. It publishes certificates of analysis for the batches that carry them, and some product pages name the batch number and the testing laboratory. It ships within the United States, with domestic delivery stated as 2 to 4 days.
As with any supplier, check that a certificate is available for the lot you receive before you rely on it.
After it arrives
Compare the label with the certificate, store the vial cold and dark, and use the reconstitution calculator and guide when you prepare it. Products sold for research are not for human or veterinary use.
Disclosure: Peptide Knowledge is affiliated with IronCell Research, a supplier of research compounds, and benefits when readers buy from it. Links to IronCell Research are marked as sponsored.