Core Peptides vs Peptide Works
Across the 39 products both vendors stock, Core Peptides has the lower effective price per mg on 6 and Peptide Works on 33. Core Peptides lists 67 tracked listings across 71 products; Peptide Works lists 87 across 51. On certificates of analysis both show broad COA coverage of the in-stock products we track. 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.
Core Peptides is a US research-peptide vendor that lists 66 injectable peptides and 15 blends, including Epitalon, PT-141 and KPV.
- Price vs market median
- 9% above market
- Tracked catalog
- 71 products · $$$
- Cheaper on
- 6 of 39 shared
- COA coverage
- Broad
Peptide Works is a research-peptide vendor that lists 85 injectable peptides, including Selank, PT-141 and Melanotan II.
- Price vs market median
- 14% below market
- Tracked catalog
- 51 products · $
- Cheaper on
- 33 of 39 shared
- COA coverage
- Broad
Vendor facts
Dashes mark facts we have not recorded yet. Vendor-stated details come from each storefront and can change without notice. Facts for Core Peptides and Peptide Works 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 Core Peptides
32 products the other vendor does not list
- NAD+$0.39
- AOD-9604 + Ipamorelin + CJC-1295 (no DAC)$6.08
- Cardiogen$3.75
- Chonluten$2.55
- Cortagen$2.95
- GHRP-2 + CJC-1295 (no DAC)$7.30
- GHRP-2 + GHRP-6 + Sermorelin$9.44
- GHRP-2 + Ipamorelin + CJC-1295 (no DAC)$9
Only at Peptide Works
12 products the other vendor does not list
- 5-Amino-1MQ$3
- Melanotan II$2.40
- SS-31$6.96
- Adamax$10.93
- AICAR$0.66
- Follistatin$107.43
- GDF-8 (Myostatin)$106.82
- Glutathione$0.11
Prices shown are per mg for the cheapest in-stock listing we track.
Questions
- Is Core Peptides cheaper than Peptide Works?
- On the 39 products both vendors stock, Core Peptides has the lower effective price per mg on 6 and Peptide Works on 33. 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?
- Core Peptides: broad, newest test dated 2026-07-22. Peptide Works: broad, newest test dated 2025-09-21. 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 Core Peptides and Peptide Works?
- Core Peptides: ships domestically within the US, accepts card. Peptide Works: accepts card, zelle, wire, crypto. Details come from each vendor's own site and can change without notice; check the storefront before ordering.