SR9009 (stenabolic) is a lab compound that acts on Rev-erb, a protein involved in the body clock and metabolism. Mouse studies showed better endurance and fat metabolism, which is where the “exercise in a pill” reputation comes from. There are no human trials, and it is poorly absorbed when swallowed.
- It is not a SARM, despite being sold alongside them.
- All the headline results come from mice, mostly given injections.
- Product tests often find little or no SR9009 in capsules and liquids.
SR9009 is popular with people who want better cardio and fat loss without hormones. The science behind it is real but early, and the gap between the mouse data and what people buy is large. Here is an honest look.
What SR9009 is
SR9009 was developed at the Scripps Research Institute in Florida as a research tool to study Rev-erb alpha and beta. These proteins help set the body’s circadian rhythm and control genes involved in fat and glucose metabolism, inflammation and mitochondrial activity. SR9009 activates them. It was never developed as a drug and has never been tested in people.
It is often called a SARM, but it does not act on the androgen receptor at all, so it does not build muscle the way SARMs or steroids do and does not suppress testosterone.
What the mouse studies showed
- 2012, Nature: obese mice given SR9009 lost fat, burned more energy and had better cholesterol and blood sugar.
- 2013, Nature Medicine: mice given SR9009 ran considerably longer on a treadmill, with more mitochondria in their muscles.
- Later studies explored effects on sleep, anxiety, and some cancer cell lines.
In these studies, SR9009 was usually given by injection into the abdomen. A 2017 study raised a further question: some effects of SR9009 occurred even in cells lacking Rev-erb, suggesting it acts on other targets too. That makes the mouse results harder to interpret.
The absorption problem
SR9009 has very poor oral bioavailability: when swallowed, little reaches the bloodstream, and what does is cleared quickly. Researchers used injections for that reason. Most products sold to consumers are capsules or liquids taken by mouth. Some sellers market sublingual or “SR9011” versions, but there is no published human data on any of them.
Product quality
Independent tests of products sold as SR9009 have repeatedly found that many contain little or none of the stated compound, or contain other substances. Because the expected effects are subtle, buyers often cannot tell. Batch-specific lab results are the only way to know what is in the bottle; see how to judge research compound quality.
Possible risks
With no human studies, side effects in people are unknown. Theoretical concerns include:
- Disruption of sleep and circadian rhythm, since Rev-erb controls the body clock
- Effects on liver metabolism and blood sugar
- Unknown long-term effects of altering gene expression
- Off-target effects suggested by laboratory research
User reports most often mention trouble sleeping and fatigue. Anyone with diabetes, liver disease, a sleep disorder or a history of cancer should avoid it.
What actually improves endurance
The mechanisms SR9009 targets in mice, more mitochondria and better fat burning, are exactly what endurance training does in humans, with decades of evidence:
- Regular zone 2 cardio (a pace where you can still talk) three to five times a week
- One or two harder interval sessions a week
- Enough sleep, which also supports the circadian system SR9009 targets
- Adequate carbohydrate around hard sessions
See our guides to HIIT workouts and rowing machine training, and Cardarine, another compound marketed for endurance.
Sleep, the body clock and Canadian winters
Because Rev-erb is part of the circadian clock, much of the interest in SR9009 comes from research on how body timing affects metabolism. You can influence the same system without a research chemical. Regular sleep and wake times, bright light early in the day, and dim light in the evening all help keep the body clock stable. This matters more in Canada, where short winter days and long summer evenings shift light exposure dramatically. Shift workers, whose clocks are constantly disrupted, have higher rates of weight gain and metabolic problems, which researchers link partly to circadian disruption. See fat loss for shift workers and sleep and recovery.
Sport and legal status
SR9009 is prohibited at all times under the World Anti-Doping Agency code as a metabolic modulator, and tests exist for it. It is not authorised by Health Canada for human use and is sold for research only.
Frequently asked questions
Is SR9009 a SARM?
No. It acts on Rev-erb proteins involved in the body clock and metabolism, not on the androgen receptor.
Does SR9009 work in humans?
It has never been tested in humans. The endurance and fat-loss results come from mouse studies, mostly using injections.
Does SR9009 work when taken orally?
It is poorly absorbed when swallowed, which is a major reason researchers used injections in mice.
Photo: rawpixel (public domain).
General information about a research compound, not medical advice. SR9009 is not approved for human use in Canada.
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