Here’s an overview of S-23 SARM powder—what it is, how it’s used, potential effects, risks, legal status, and what users have shared about it. This information is based on preclinical studies and anecdotal reports—not medical advice.
What Is S-23?
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S-23 is a Selective Androgen Receptor Modulator (SARM)—a class of investigational compounds designed to selectively activate androgen receptors in muscle and bone tissues, aiming to stimulate muscle growth and bone density with fewer side effects compared to traditional steroids.
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It binds strongly to androgen receptors (Ki ~1.7 nM), outperforming earlier SARMs like andarine, and was originally developed as a potential male hormonal contraceptive due to its ability to suppress spermatogenesis in animal models.
Reported Effects & Mechanism
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Muscle & Bone: Preclinical animal data suggest S-23 can increase lean muscle mass, improve bone strength, and reduce fat mass through enhanced protein synthesis and fat metabolism UnfilteredSteroiduckAlkemyalabsSports Technology LabsMuscleChemistry.
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Fat Loss & Vascularity: Users report improved muscle definition, vascularity, and a “hard, grainy” appearance—attributes valued in bodybuilding rawsteroidpowder.comnextlvlmuscle.comAlkemyalabs.
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Contraceptive Effect: In rodents, S-23 suppresses luteinizing hormone (LH) and follicle-stimulating hormone (FSH), significantly impacting fertility—but effects are reversible after discontinuation MuscleChemistrySports Technology LabsWikipedia.
Dosage & Cycle (Anecdotal)
Based on user reports and informal guidelines:
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Dosage: Typically ranges from 10 to 30 mg per day, split into two doses to align with its ~12-hour half-life MuscleChemistrynextlvlmuscle.comAlkemyalabsDeccan Herald.
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Cycle Length: Commonly used in 8 to 12-week cycles, followed by post-cycle therapy (PCT) to rebuild natural hormone levels nextlvlmuscle.comrawsteroidpowder.comMuscle and BrawnDeccan HeraldAlkemyalabs.
Potential Risks & Side Effects
While some sources downplay side effects, others highlight serious concerns:
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Hormonal Suppression & Fertility Risks: S-23 can cause profound suppression of natural testosterone, LH, FSH, with temporary but intense infertility effects UnfilteredSteroiduckmaxedmuscle.comSports Technology Labs.
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Liver Toxicity & Lipid Profile: Associated with elevated liver enzymes and possible adverse impact on cholesterol levels SteroiduckAlkemyalabs.
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Mood & Behavior: Anecdotal reports include increased aggression, mood swings, anxiety, and insomnia UnfilteredSteroiduckAlkemyalabsmaxedmuscle.comsupps-for-life.to.
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Physical Effects: Users mention hair shedding or loss, night sweats, dehydration, prostate shrinkage, testicular shrinkage, and “toxic”-smelling urine MuscleChemistryAlkemyalabssupps-for-life.toDeccan Heraldmaxedmuscle.comrawsteroidpowder.comSports Technology Labs.
Legal Status & Warnings
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Not Approved for Human Use: S-23 is unapproved by regulatory bodies like the U.S. FDA and is legally restricted to research purposes UnfilteredWikipediaSports Technology Labs.
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Sports Banned Substance: It is prohibited by major sports organizations including WADA Unfiltered
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Variable Quality: Many products sold online may be mislabeled or impure, with uncertain quality control
Real-World Anecdotes
Some user experiences from forums like Reddit illustrate both the appeal and risks:
“S23 is the most suppressive sarm … acne, insane hair loss, aggression and anxiety, insomnia … strong anabolic activity.”
— Reddit user Reddit
“I shared weekly updates… dropped a total of 5 lbs. S23 is no joke. I did not experience extreme side effects… every time I peed I could smell the toxicity.”
— Reddit user Reddit
“My libido and aggression increased a ton … strength gains are unreal … S23 feels like RAD 140 on steroids.”
— Reddit user Reddit
“Gave me extreme hair loss… aged crazy amounts… ruined my skin.”
— Reddit user Reddit
Summary at a Glance
| Aspect | Summary |
|---|---|
| What It Is | Potent investigational SARM, originally explored as male contraceptive. |
| Effects | May increase lean muscle, reduce fat, enhance bone—based on animal and anecdotal data. |
| Dosage | 10–30 mg/day split, cycles of 8–12 weeks with PCT. |
| Risks | Hormonal suppression, infertility, liver and lipid issues, mood changes, physical side effects. |
| Legal Status | Not approved for humans, banned in sports, quality concerns online. |
| User Reports | Mixed—some strong gains, others significant side effects and toxicity. |
Final Thoughts
S-23 is a powerful and experimentally potent SARM with real effects—but also very real risks. All human data remains anecdotal. If you’re considering exploring it, it’s crucial to consult a healthcare professional first. Post-cycle therapy and medical oversight are essential for mitigating severe side effects.




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