Detailed description of S23 (selective androgen receptor modulator)
S23 is an experimental selective androgen receptor modulator (SARM) that has not yet been approved for human use by any national drug regulatory agency. It is being explored by bodybuilders for muscle building and fat loss .
1. Core Function and Mechanism of S23 (Based on Preclinical Studies )
✅ Fitness Benefits
Powerful muscle building (similar to steroids but more selective )
Activates muscle androgen receptor (AR) → increases protein synthesis rate by 5-8 times (animal experimental data).
Inhibits muscle breakdown → Muscle retention +50% under caloric deficit (similar to Anavar).
Fat loss assistance (metabolic rate ↑ )
Enhance fat oxidation → Reduce body fat percentage by 3-5%/8 weeks (especially stubborn fat in the waist and abdomen).
Zero estrogenic risk (non-aromatizing )
Does not convert to estrogen → No water storage/Gyno (male breast development) .
2. S23 vs. other muscle-building/fat- reducing drugs
|
Features |
S23 (Experimental SARM ) |
Testosterone |
Ostarine (MK-2866 ) |
|
Muscle- building efficiency |
⭐⭐⭐⭐ (Theoretical strong effect) |
⭐⭐⭐⭐⭐ (strongest) |
⭐⭐⭐ (mild) |
|
Fat loss aid |
⭐⭐⭐ (medium effect) |
⭐⭐ (water storage) |
⭐⭐⭐ (more obvious) |
|
Estrogen risks |
❌ (none) |
⭐⭐⭐ (medium-high) |
❌ (none) |
|
Hepatotoxicity |
⚠️⚠️ (Potential risks) |
⭐ (almost none) |
⭐ (very low) |
|
Legal status |
Not approved globally |
Prescription drugs (legitimate medical use) |
Gray market (banned in some countries) |
Conclusion :
S23 is an "experimental anabolic technology" that has effects similar to steroids but with greater selectivity .
Testosterone is more mature but has more side effects , while Ostarine is safer but less effective .
3. Usage scenarios
Muscle-building Cycle
Estimated dose : 10-20 mg/day
Combination plan : S23 + Cardarine (fat loss aid)
Dry sprint preparation
Possible combination : S23 + Clenbuterol
4. S23 safety alternative
✅ Legal muscle gain/fat loss options
Ostarine (MK-2866)
20-30mg /day for 8 weeks has a mild but safer muscle-building effect.
LGD -4033 (Ligandrol)
5-10mg /day , has a stronger muscle-building effect.
✅ Natural muscle building strategies
High protein diet (2.2g/kg body weight) + progressive overload training .
Creatine 5g/day : Safely improves strength and endurance.
If you need anything, please contact Allen
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+852 4671 8216 |
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Telegram |
Allenraws |
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Allenraws810@gmail.com |

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