Our tested suppliers
Last updated Oct 8, 2026
Affiliate disclosure: Paramount Peptides and Peptira are both our affiliate partners. We earn a commission when you buy through our links or use code SKYLER, at no extra cost to you. Peptides & Coffee isn't owned by either supplier or by any lab. Full disclosure
We work with two suppliers that publish third-party lab certificates (COAs) for their lots. Every certificate we have for them is in our COA lookup, with a link to the lab's own record so you can check it yourself.
Jump to: Paramount Peptides · Peptira · Code SKYLER
Paramount Peptides
- What they carry: ARA-290, BPC-157, Cartalax, CJC-1295 (no DAC), CJC-1295 (with DAC), DSIP, Epitalon, FOXO4-DRI, GHK-Cu, GHRP-6, IGF-1 LR3, Ipamorelin, KPV, LL-37, MOTS-c, PE-22-28, Selank, Semax, SS-31, TB-500 (thymosin beta-4), Thymagen (Thymogen), Thymalin, Thymosin alpha-1, plus blends and other products (87 products with certificates on file)
- Also listed, no certificate published yet: Klotho (a-Klotho LR (10mcg))
- Labs on their certificates: Janoshik, Accumark Labs
- Lots with a certificate on file: 541 · newest report Sep 22, 2026
- Code: SKYLER = 10% off (offer as of Oct 7, 2026)
How to verify a Paramount Peptides COA
- Find the lot number on your vial label and look it up in our COA lookup.
- Open the lab's record from the lot page and check that the lot, dates and results match:
- Janoshik: Go to janoshik.com/verify and enter the unique key printed on the report (the report's QR code links there too). Janoshik blocks automated checks, so we haven't matched these records ourselves.
- Accumark Labs: Open accumarklabs.com/verify and enter the verification code (Report ID). The live record should show the same lot, dates and results as our lot page.
Shop Paramount Peptides ↗ Paid link · code SKYLER applies at checkout · All Paramount Peptides lots
Peptira
- What they carry: ARA-290, BPC-157, Cartalax, CJC-1295 (no DAC), CJC-1295 (with DAC), DSIP, Epitalon, FOXO4-DRI, GHK-Cu, GHRP-6, IGF-1 LR3, Ipamorelin, KPV, LL-37, MOTS-c, PE-22-28, Selank, Semax, SS-31, TB-500 (thymosin beta-4), Thymagen (Thymogen), Thymalin, Thymosin alpha-1, plus blends and other products (73 products with certificates on file)
- Labs on their certificates: Freedom Diagnostics, Janoshik
- Lots with a certificate on file: 308 · newest report Sep 14, 2026
- Code: SKYLER = 10% off (offer as of Oct 7, 2026)
How to verify a Peptira COA
- Find the lot number on your vial label and look it up in our COA lookup.
- Open the lab's record from the lot page and check that the lot, dates and results match:
- Freedom Diagnostics: Search the Search Code on freedomdiagnosticstesting.com. The lab hosts its own PDF copy of each certificate, which should match the vendor's copy.
- Janoshik: Go to janoshik.com/verify and enter the unique key printed on the report (the report's QR code links there too). Janoshik blocks automated checks, so we haven't matched these records ourselves.
Shop Peptira ↗ Paid link · code SKYLER applies at checkout · All Peptira lots
Offer as of Oct 7, 2026. SKYLER is Skyler Humphrey's affiliate code: we earn a commission on orders that use it, at no extra cost to you. Code details
How we list suppliers
- We list every certificate we can find for each supplier, including lots below 98% purity and lots we couldn't match to a lab record, so you can read each one for yourself.
- Certificate counts come from the COAs each supplier links publicly; some product types are left out by our editorial policy (see the COA lookup).
- Products from both suppliers are sold for laboratory research use only, not for human or veterinary consumption. Listing a supplier isn't a recommendation for any use.
Looking for one compound? See where to get lab-tested lots.