Modern Research Peptides vs Peptide Works
Across the 34 products both vendors stock, Modern Research Peptides has the lower effective price per mg on 22 and Peptide Works on 12. Modern Research Peptides lists 83 tracked listings across 44 products; Peptide Works lists 92 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.
Modern Research Peptides is a US research-peptide vendor that lists 79 injectable peptides, including NAD+, BPC-157 and Retatrutide.
- Price vs market median
- 32% below market
- Tracked catalog
- 44 products · $
- Cheaper on
- 22 of 34 shared
- COA coverage
- Broad
Peptide Works is a research-peptide vendor that lists 84 injectable peptides, including PT-141, Melanotan II and GHK-Cu.
- Price vs market median
- 19% below market
- Tracked catalog
- 51 products · $
- Cheaper on
- 12 of 34 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 Modern Research 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 Modern Research Peptides
10 products the other vendor does not list
- 5-Amino-1MQ$0.98
- Retatrutide$2.20
- Tirzepatide$1.76
- Cagrilintide$6.67
- Cardiogen$2.29
- L-Carnitine$0.07
- Matrixyl$6
- PE-22-28$4.50
Only at Peptide Works
17 products the other vendor does not list
- FOXO4-DRI$22.27
- ACE-031$116.79
- Adamax$10.72
- Adipotide$8.31
- AICAR$0.64
- AOD-9604$7.64
- B7-33$9.53
- Bronchogen$2.46
Prices shown are per mg for the cheapest in-stock listing we track.
Questions
- Is Modern Research Peptides cheaper than Peptide Works?
- On the 34 products both vendors stock, Modern Research Peptides has the lower effective price per mg on 22 and Peptide Works on 12. 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?
- Modern Research Peptides: broad, newest test dated 2026-07-13. 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 Modern Research Peptides and Peptide Works?
- Modern Research Peptides: shipping $9.99. 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.