Peptides Greyhouse vs Zesty Rat
Across the 29 products both vendors stock, Peptides Greyhouse has the lower effective price per mg on 13 and Zesty Rat on 15, and 1 prices the same to the cent. Peptides Greyhouse lists 94 tracked listings across 62 products; Zesty Rat lists 43 across 31. On certificates of analysis the in-stock products we track rate none found at Peptides Greyhouse and partial at Zesty Rat. 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.
Peptides Greyhouse is a research-peptide vendor that lists 92 injectable peptides, including Selank, Semax and Epitalon.
- Price vs market median
- 8% above market
- Tracked catalog
- 62 products · $$$
- Cheaper on
- 13 of 29 shared
- COA coverage
- None found
Zesty Rat is a US research-peptide vendor that lists 34 injectable peptides, including Pinealon, TB-500 and SS-31.
- Price vs market median
- At market price
- Tracked catalog
- 31 products · $$
- Cheaper on
- 15 of 29 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 Zesty Rat 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 Peptides Greyhouse
33 products the other vendor does not list
- Ipamorelin$5.50
- NAD+$0.27
- Selank$1.90
- Semax$2.40
- Tesamorelin$9.45
- Tirzepatide$11.83
- Adamax$7.50
- Cagrilintide$15
Only at Zesty Rat
2 products the other vendor does not list
Prices shown are per mg for the cheapest in-stock listing we track.
Questions
- Is Peptides Greyhouse cheaper than Zesty Rat?
- On the 29 products both vendors stock, Peptides Greyhouse has the lower effective price per mg on 13 and Zesty Rat on 15, with 1 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?
- Peptides Greyhouse: none found. Zesty Rat: partial, newest test dated 2026-10-02. 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 Peptides Greyhouse and Zesty Rat?
- Peptides Greyhouse: we have not recorded shipping or payment details yet. Zesty Rat: ships from United States, shipping free, 2-4 days in transit, accepts card. Details come from each vendor's own site and can change without notice; check the storefront before ordering.