Reviews
In-depth, research-based reviews of every research peptide vendors we rank: fees, features, safety and real user ratings.
Peptidology review
8.1/10 · #1 ranked
Lot-numbered COAs from named labs, dated to Sep 2026
Limitless Biotech review
7.6/10 · #2 ranked
Batch COAs covering purity, sterility and endotoxin
Ascension Peptides review
6.4/10 · #3 ranked
Searchable COA library with 85 records, US-only shipping
Core Peptides review
5.0/10 · #4 ranked
Large catalog; COA images, lab not clearly named
Biotech Peptides review
4.6/10 · #5 ranked
Recent COA images, no named lab or community tests