SLU-PP-332
An experimental exercise-mimetic small molecule (not a peptide) with rodent-only evidence; no human studies of any kind have been published.
What it is
SLU-PP-332 is an experimental small molecule — not a peptide — that activates estrogen-related receptors (ERRs), the transcription factors behind muscle's endurance programming. It's the newest 'exercise in a pill' candidate, and it exists only in rodent research.
Mice given it showed increased running endurance and fat oxidation without training. There are no human studies of any kind — not even safety — which makes its gray-market availability a pure act of extrapolation.
What researchers have actually studied it for
Endurance and muscle metabolism — in mice and cells only; among the youngest and least human-tested compounds sold anywhere in this market.
How it works
It's a pan-agonist of ERRα/β/γ — nuclear receptors that switch on mitochondrial biogenesis and oxidative-fiber programs in muscle, the machinery endurance training builds. Activating the program chemically is the whole hypothesis.
Where it came from
Developed in academic medicinal-chemistry work published around 2023 (its name comes from Saint Louis University), SLU-PP-332 drew headlines from rodent endurance findings and jumped to research-chemical catalogs within months — one of the fastest lab-to-gray-market pipelines on record.
What the research record actually contains
- Rodent studies: increased endurance capacity and fat oxidation.
- Cell-level work on ERR activation and muscle-fiber programming.
- No human data of any kind, including safety.
What's known about risks
Nothing is known in humans. Nuclear-receptor agonists reshape gene expression broadly — a category where 'no human data' should end the conversation for self-experimenters.
Where it stands legally
No approval anywhere; research-chemical channel only. Given AICAR precedent, tested athletes should assume anti-doping scrutiny of exercise mimetics.
Worth asking a licensed provider
- 1.Am I clear there are zero human studies — safety included?
- 2.What would actual training changes accomplish toward the same goal?
- 3.If I compete, how do exercise mimetics sit with my sport's rules?