A new research compound that switches on the body's own energy pathways, studied as an “exercise mimetic”.
- TypeSynthetic small molecule
- TargetEstrogen-related receptors (ERRα, β and γ)
- Developed atSaint Louis University, USA
- Research stagePreclinical (laboratory and animal studies)
- In Apollo XSLU-PP-332 Skin Patch – Advanced Wellness Patch
What is SLU-PP-332?
SLU-PP-332 is a synthetic small molecule created by chemists and pharmacologists at Saint Louis University in the United States, the “SLU” in its name. It was designed to activate a family of proteins called estrogen-related receptors, or ERRs, which act as master switches for how cells produce and use energy. It is one of the newest compounds in metabolic research, with its key studies published from 2022 onwards.
Meet the ERRs
Despite the name, estrogen-related receptors are not activated by estrogen. They were named for their structural similarity to estrogen receptors when they were discovered in the late 1980s, but they work independently of hormones. There are three types, ERRα, ERRβ and ERRγ, and they are most active in tissues with high energy demands such as the heart, skeletal muscle, kidneys and brain.
ERRs work with a partner protein called PGC-1α to control genes involved in building new mitochondria (mitochondrial biogenesis), burning fatty acids for fuel and running oxidative metabolism. When you exercise regularly, these same programs are switched on, which is part of how training makes muscles more efficient and more resistant to fatigue.
The “exercise mimetic” idea
Scientists have long been interested in whether some of the benefits of exercise could be triggered at the molecular level, for example to support people whose ability to exercise is limited. Compounds designed to do this are known as exercise mimetics. SLU-PP-332 activates all three ERRs, with its strongest effect on ERRα, and was designed to switch on parts of the same energy programs that exercise activates.
What the studies found
The published research on SLU-PP-332 has been carried out in cells and in mice. In those studies, researchers reported that:
- treated mice developed a higher proportion of oxidative, fatigue-resistant muscle fibres;
- treated mice could run longer and further on a treadmill than untreated mice;
- the compound increased the use of fat as fuel and raised energy expenditure;
- in mouse models of obesity, treated animals gained less fat and showed better insulin sensitivity, without changes in how much they ate.
These are striking results, and they explain why SLU-PP-332 has attracted so much attention. They are also early.
What we don't know yet
As of today, there are no published clinical trials of SLU-PP-332 in humans. That means:
- the effects seen in mice have not been confirmed in people;
- appropriate amounts for humans have not been established through clinical research;
- long-term safety in humans has not been studied.
Results in animals often fail to carry over to humans. SLU-PP-332 should be understood as an emerging research compound, not a proven treatment.
We think it is one of the most interesting molecules in metabolic science right now, and we think you deserve to know exactly where the evidence stands.
Why it's part of Apollo X
Apollo X exists to bring the latest innovation in supplements to people who want to stay at the frontier. SLU-PP-332 represents exactly that frontier: a new class of compound aimed at the body's own energy machinery. Our patch format holds it in a sustained-release matrix beneath a breathable protective film, designed to be worn for up to 8–12 hours.
Using the SLU-PP-332 Skin Patch
- Apply to clean, dry, relatively hair-free skin such as the upper arm, shoulder, upper back or abdomen.
- Press firmly around the edges, then remove the protective outer film.
- Wear for up to 8–12 hours, then gently remove and discard. Do not reuse.
- Use a different area with each new patch.
For external use only. Do not apply to broken, damaged or irritated skin, and discontinue use if irritation occurs. Read the full label, including the caution panel, before use.
Frequently asked questions
Is SLU-PP-332 a hormone or a steroid?
No. Although it acts on “estrogen-related” receptors, these receptors do not respond to estrogen, and SLU-PP-332 is neither a hormone nor a steroid.
Can it replace exercise?
No. Exercise has broad benefits for the heart, muscles, bones, mood and more, and no compound replaces it. SLU-PP-332's exercise-like effects have so far only been seen in animal studies.
Is it suitable for everyone?
Because human research has not yet been published, speak with your healthcare professional before use, especially if you are pregnant or breastfeeding, under 18, take medication or have a medical condition.
This information is general and educational and is not medical advice. Research on SLU-PP-332 is preclinical and its effects in humans have not been established. Apollo X products are not intended to diagnose, treat, cure or prevent any disease. Always read the label and use only as directed. Speak with your healthcare professional before use.