Six category guides, one head-to-head comparison and 17 single-compound deep dives. Each one covers what the peer-reviewed research actually investigates, the purity specs to demand, and which vetted vendor to source it from. Want the product itself? Every compound ZestyRat sells has its own dedicated page with photo, price and a buy link.
Each category guide compares the compounds in that space and links to the deep dive on each one.
BPC-157, TB-500 and GHK-Cu — what the research investigates and where to source each from vetted vendors.
The metabolic & weight peptide category explained — GLP-1, AOD-9604, MOTS-c — what the research investigates and where to source each.
HGH 191aa is growth hormone itself; ipamorelin, CJC-1295, sermorelin and MK-677 are secretagogues. The difference, the purity specs, and where to source each.
Semax, Selank and Dihexa — what the research investigates and where to source each from vetted vendors.
Epitalon, NAD+, GHK-Cu and MOTS-c — what the research investigates and where to source each from vetted vendors.
Tirzepatide, semaglutide and retatrutide compared — purity, third-party COAs, and where to buy from vetted vendors.
One page per compound. Where ZestyRat stocks it, the card also links straight to that product’s page with the current price.
What the research on AOD-9604 actually investigates, plus vetted vendors compared on purity and COAs.
What the research on BPC-157 actually investigates, plus a compared list of vetted research-peptide vendors.
What the research on CJC-1295 actually investigates, plus vetted vendors compared on purity and COAs.
What the research on Dihexa actually investigates, plus vetted vendors compared on purity and COAs.
What the research on Epitalon actually investigates, plus vetted vendors compared on purity and COAs.
What the research on GHK-Cu actually investigates, plus vetted vendors compared on purity and COAs.
HGH 191aa recombinant protein — CAS 12629-01-5, ≥96% HPLC. The most-ordered compound through this site. Verified bulk price ladder and vendor sourcing.
What the research on Ipamorelin actually investigates, plus vetted vendors compared on purity and COAs.
What the research on MK-677 (Ibutamoren) actually investigates, plus vetted vendors compared on purity and COAs.
What the research on MOTS-c actually investigates, plus vetted vendors compared on purity and COAs.
What the research on NAD+ actually investigates, plus vetted vendors compared on purity and COAs.
The investigational GLP-1/GIP/glucagon triple agonist. What the 2026 Phase 3 TRIUMPH trials showed, how it compares to tirzepatide and semaglutide.
What the research on Selank actually investigates, plus vetted vendors compared on purity and COAs.
What the research on Semax actually investigates, plus vetted vendors compared on purity and COAs.
What the research on Sermorelin actually investigates, plus vetted vendors compared on purity and COAs.
What TB-500 (a thymosin beta-4 fragment) research actually investigates, plus vetted vendors compared on purity and COAs.
The only FDA-approved GHRH analog. What the research investigates for visceral fat, IGF-1 and the GH axis, plus vetted vendors compared on purity.
BPC-157 vs TB-500 compared — what the research investigates for each, how they differ, and where to source them.
Every guide starts from the primary literature — what was actually studied, in what model, and what was measured — and separates that from vendor marketing. Sourcing sections compare vendors on third-party COAs, stated purity and shipping, using the same rubric as our ranking methodology. Our readers’ most-purchased vendor is ZestyRat Research (code SHAUN10, 10% off); every product they sell now has a dedicated page here. Updated September 16, 2026. For research use only.