SLU-PP-332
A synthetic small molecule that activates the same gene pathways as exercise — without moving a muscle. SLU-PP-332 is extremely early-stage research with zero human data, but the concept has captured the longevity community's attention.
SLU-PP-332 is a synthetic compound that activates ERR (estrogen-related receptor) transcription factors — the same pathway your body uses to adapt to exercise. In mice, it increased endurance, boosted mitochondrial biogenesis, and shifted muscle fiber composition toward fatigue-resistant types. It's not a peptide technically, but it's discussed alongside them in the biohacking space.
Who's interested: Longevity researchers following exercise-mimetic science. This is a watch-and-wait compound — almost no one should be using it yet given the zero human data.
Dive deeper into the researchPotential side effects
- Unknown — no human studies exist
- Theoretical hormonal effects via ERR pathway
- Potential liver stress from oral administration (unstudied)
What does SLU-PP-332 do?
When you exercise, your muscles activate a family of transcription factors called ERRs (estrogen-related receptors). Despite the name, these have nothing to do with estrogen — they control genes involved in mitochondrial biogenesis, fat oxidation, and muscle fiber adaptation.
SLU-PP-332 activates all three ERR subtypes (alpha, beta, gamma), essentially flipping the same genetic switches that exercise does. In mice, this led to increased running endurance (~70% improvement), more Type I (slow-twitch) muscle fibers, and enhanced mitochondrial function.
Who uses it?
- Almost nobody — this is one of the most experimental compounds discussed in the longevity space
- A small number of aggressive biohackers have experimented with it
- Most longevity researchers are watching with interest but waiting for any human data
What to know before trying
SLU-PP-332 was published in a single 2023 paper from Washington University. There are zero human studies, zero safety data in humans, and no established human dose. Using this compound is genuine self-experimentation with an unknown risk profile.
- Only mouse data exists — a single published study
- Not the same as MOTS-c — different mechanism entirely (ERR vs AMPK)
- Sourcing is questionable — very few vendors carry it, and verification is nearly impossible
- Exercise is still better — nothing replaces actual physical activity for health
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Get early accessFrequently Asked Questions
Is SLU-PP-332 really an exercise pill?
In mice, it activated exercise-related gene pathways and improved endurance without training. But calling it an 'exercise pill' is a stretch — exercise has hundreds of effects on the body that no single compound can replicate. And no human has been tested with it.
SLU-PP-332 vs MOTS-c — which is better?
Different mechanisms entirely. MOTS-c is an endogenous mitochondrial peptide that activates AMPK. SLU-PP-332 is a synthetic molecule that activates ERR transcription factors. Neither has human data. MOTS-c has more research overall. Both are purely experimental.
Is SLU-PP-332 available in India?
Some research chemical vendors list SLU-PP-332, but availability is very limited and quality verification is essentially impossible. It is not approved for any use in any country.
Should I try SLU-PP-332?
For the vast majority of people, no. There is zero human safety data. If you want exercise-mimetic benefits, actual exercise, AMPK activators like metformin or berberine, or even well-studied supplements like NMN are all better-supported options.
How it works
- ERR activation — activates ERRα, ERRβ, and ERRγ simultaneously
- Mitochondrial biogenesis — increases PGC-1α expression, driving new mitochondria formation
- Muscle fiber switching — promotes conversion from Type II (fast-twitch) to Type I (slow-twitch) fibers
- Fat oxidation — shifts muscle metabolism toward fat burning, similar to endurance training
The mouse study
The 2023 paper by Weijie and colleagues at Washington University showed that mice treated with SLU-PP-332 ran ~70% farther on a treadmill test, had increased Type I muscle fibers, higher mitochondrial gene expression, and improved metabolic markers — all without any exercise training.
Side effects & safety
Completely unknown in humans. Theoretical concerns:
- Hormonal effects — ERRs interact with metabolic and hormonal pathways; unintended effects are plausible
- Liver burden — oral compounds often require hepatic metabolism; no toxicology data exists
- Muscle composition changes — shifting fiber types could affect strength and power output
- Cancer risk — ERR activation could theoretically promote growth in hormone-sensitive cancers
Who should avoid it: Everyone except perhaps the most informed self-experimenters with full awareness of the risks. No established safety profile exists.
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