Peptide Supply Co vs Welli Labs
Across the 34 products both vendors stock, Peptide Supply Co has the lower effective price per mg on 9 and Welli Labs on 21, and 4 price the same to the cent. Peptide Supply Co lists 71 tracked listings across 52 products; Welli Labs lists 60 across 39. On certificates of analysis the in-stock products we track rate broad at Peptide Supply Co and partial at Welli Labs. Based on the certificates our crawler found; vendors may publish more than we index. These are price and document observations, not quality ratings, and neither vendor is endorsed.
Peptide Supply Co is a US research-peptide vendor that lists 60 injectable peptides, 11 blends and 1 capsule.
- Price vs market median
- 21% below market
- Tracked catalog
- 52 products · $
- Cheaper on
- 9 of 34 shared
- COA coverage
- Broad
Welli Labs is a US research-peptide vendor that lists 57 injectable peptides and 7 blends.
- Price vs market median
- 33% below market
- Tracked catalog
- 39 products · $
- Cheaper on
- 21 of 34 shared
- COA coverage
- Partial
Vendor facts
Dashes mark facts we have not recorded yet. Vendor-stated details come from each storefront and can change without notice. Facts for Peptide Supply Co and Welli Labs were extracted from the vendor's site and not yet reviewed by us.
Certificates on file
Coverage rates how many of the in-stock products we track have a certificate our pipeline read and matched to a catalog peptide. Based on the certificates our crawler found; vendors may publish more than we index. We do not test products, and a certificate cannot show authenticity, chain of custody or sterility.
Carried by one vendor only
Only at Peptide Supply Co
18 products the other vendor does not list
- CJC-1295 (no DAC)$5.50
- SS-31$5
- Cartalax$2.50
- CJC-1295 (with DAC)$10
- Dihexa$16
- GHK-Cu + KPV$0.93
- GLOW$1.11
- Livagen$2.50
Only at Welli Labs
5 products the other vendor does not list
- Cerebrolysin$1
- Mazdutide$8
- Oxytocin$5.50
- Semaglutide$2.17
- Thymalin$4.50
Prices shown are per mg for the cheapest in-stock listing we track.
Questions
- Is Peptide Supply Co cheaper than Welli Labs?
- On the 34 products both vendors stock, Peptide Supply Co has the lower effective price per mg on 9 and Welli Labs on 21, with 4 priced the same to the cent. Each side uses the cheapest in-stock listing we track for that product, after any public discount code, and prices change often.
- How much COA coverage does each vendor have?
- Peptide Supply Co: broad, newest test dated 2026-09-11. Welli Labs: partial, newest test dated 2026-08-04. Based on the certificates our crawler found; vendors may publish more than we index. We do not test products ourselves, and a certificate cannot prove authenticity or sterility.
- How do shipping and payment differ between Peptide Supply Co and Welli Labs?
- Peptide Supply Co: shipping free, 2-2 days in transit. Welli Labs: accepts card, crypto, ach. Details come from each vendor's own site and can change without notice; check the storefront before ordering.