S 23, also known by its research name Mastorin, is one of the most potent selective androgen receptor modulators (SARMs) developed to date. Designed for hardcore performance enhancement, Dragon Pharma S 23 offers strength, muscle hardness, and fat loss benefits that rival many anabolic steroids—yet without the same estrogenic effects. Ideal for users pursuing serious recomposition cycles, it’s particularly popular in pre-contest phases.
DRUG DESCRIPTION
S 23 is a non-steroidal SARM that binds with high affinity to androgen receptors in muscle and bone, producing intense anabolic effects while sparing other tissues. What sets it apart is its potential for complete suppression of spermatogenesis, which is why researchers are also investigating it as a male contraceptive [NIH Study].
Dragon Pharma produces pharmaceutical-grade S 23 tablets, ensuring consistency, purity, and lab-verified strength with every batch.
S 23 PROFILE
Drug Class: SARM (Selective Androgen Receptor Modulator)
Main Active Substance: S 23 (Mastorin)
Concentration: 10 mg per tablet
Presentation: 100 tablets per bottle
Elimination Half-Life: ~12 hours
Recommended Dosage: 10–30 mg daily (split doses)
Anabolic Ratio: 1000:1 (estimated)
Androgenic Ratio: Moderate to high
Acne: Possible
Hepatotoxicity: Low to moderate (dose-dependent)
Aromatization: None
Manufacturer: Dragon Pharma
HOW TO USE S 23
Due to its high potency, users often begin with 10 mg per day, split into morning and evening doses to maintain blood stability. Advanced users may increase to 20–30 mg for cutting or recomposition cycles lasting 6–8 weeks. Because S 23 strongly suppresses natural testosterone production, a comprehensive PCT is essential.
To support results and minimize side effects, S 23 is frequently stacked with Ostarine or Ligandrol for synergistic lean muscle retention.
POSSIBLE SIDE EFFECTS
Common side effects include testosterone suppression, aggression, night sweats, or reduced libido during or post-cycle. Since S 23 does not aromatize, estrogen-related side effects are minimal. However, PCT with Clomid or Enclomiphene is highly recommended to restore hormonal balance.
LAB TEST REPORT
Independent lab analysis conducted on 2025-04-18 confirmed the dosage accuracy of Dragon Pharma S 23. The reported value was 12.43 mg per tablet, validating superior over-label purity standards.
LEGIT S 23 SUPPLIERS
When sourcing high-quality SARMs, trust manufacturers that provide transparency. Dragon Pharma is known for its consistent lab testing and pharmaceutical-grade control. One third-party verification further affirms their manufacturing standards. You can get this compound from a reputable SARMs supplier known to carry Dragon Pharma S 23 under verified labeling.
CONCLUSION
S 23 is an advanced SARM option for experienced users looking to push their cutting or recomposition results beyond plateau. Its strength lies in high anabolic activity with zero estrogen conversion, though it demands proper cycle planning and post-therapy. For those seeking elite performance and definition, this premium version of S 23 is worth serious consideration.
MASTORIN FAQ
It’s mainly used for cutting cycles to improve muscle hardness, vascularity, and fat loss without estrogenic side effects.
Yes, it is among the most potent SARMs and is often compared to anabolic steroids in terms of strength gains and suppression.
Absolutely. S 23 causes near-complete suppression, so Clomid or Enclomiphene is required post-cycle.
It is not recommended due to its androgenic effects and strong hormonal suppression.
10 mg daily, split into two 5 mg doses, is a safe entry point for new users.