


Classification: SARM (Selective Androgen Receptor Modulator)
Active substance: Mastorin (S-23)
Manufacturer: Dragon Pharma
Form/Strength: Tablet, 10 mg
Pack size: 100 tablets
Route: Oral
Lab Test: View Result
WARNING: S-23 (Mastorin) is one of the most potent and suppressive SARMs available. It is intended ONLY for highly experienced users who understand and accept the significant risk of severe testosterone suppression and require a rigorous Post-Cycle Therapy (PCT) protocol.
For advanced bodybuilders seeking steroid-like gains in lean muscle mass and strength from a selective compound, S-23 (Mastorin) stands at the pinnacle of SARM potency. This powerful Selective Androgen Receptor Modulator is renowned for its high binding affinity and ability to produce dramatic, dry gains. Sourcing a genuine and accurately dosed product is non-negotiable for managing its powerful effects. This batch from Dragon Pharma is independently lab-tested to confirm a potency of 12.43 mg per tablet, ensuring you receive a superior and reliable product when you buy S 23 online.
S-23's effects are profound and comparable to mild anabolic steroids. Users experience rapid and significant increases in lean muscle mass, exceptional strength gains, and enhanced muscle hardness and density. It promotes a dry, quality look with no estrogenic activity (no water retention or gynecomastia). Its high selectivity aims to minimize androgenic side effects, but its sheer potency makes some androgenic activity possible. According to research on PubChem, S-23 has a very high binding affinity for the androgen receptor and was initially researched for its potential as a male contraceptive due to its strong suppressive effects on the HPTA axis, which directly explains its potency and impact on testosterone production.
Due to its extreme potency and suppression, dosing must be approached with extreme caution. A common effective dosage for experienced male users ranges from 10 mg to 20 mg per day. It is imperative to start at the lowest possible dose (10 mg) for the first week to assess tolerance. The dose can be carefully increased to 15 mg or 20 mg for more advanced users. Its half-life is approximately 12-16 hours, making split dosing (e.g., morning and evening) beneficial for stable blood levels. Cycle length should be strictly limited to 6-8 weeks to manage suppression.
S-23 is highly suppressive and must be run with a testosterone base for any cycle longer than 4 weeks to avoid low-T symptoms. A comprehensive PCT is mandatory.
Sample Advanced Mass Building Stack (8 weeks):
Sample Cutting & Hardening Stack (6 weeks):
The precision of this product is critical for managing such a powerful cycle safely.
S-23's side effect profile is significant and is dominated by its suppressive nature.
Managing these risks requires a short cycle length, a testosterone base, and a powerful PCT protocol.
When using a compound as potent and suppressive as S-23, product purity and accurate dosing are not just about results—they are about safety and predictable recovery. An underdosed product will yield poor results after significant suppression, while an impure one could exacerbate side effects. The recent independent lab verification of this batch confirms its exceptional quality and shows it is slightly overdosed, a mark of a trustworthy product. This reliability is essential for any user considering this S 23 supplement by Dragon Pharma and ensures you can plan your cycle and PCT with confidence.
Date: 2025-04-18
Result: 12.43 mg/tab
S-23 is arguably the most suppressive SARM available. It was originally researched for use as a male contraceptive because of its potent ability to suppress the hypothalamic-pituitary-testicular axis (HPTA). Users can expect near-total shutdown of natural testosterone production, similar to a moderate steroid cycle. This is why running a testosterone base is highly recommended for cycles longer than 4 weeks, and a strong PCT with SERMs like Clomid and Nolvadex is absolutely mandatory afterwards.
Due to severe suppression, a robust Post-Cycle Therapy (PCT) protocol is critical. Begin PCT 2-3 days after your last S-23 dose. A strong and effective protocol includes:
- Clomid (Clomiphene Citrate): 50 mg/day for 4 weeks
- Nolvadex (Tamoxifen Citrate): 40 mg/day for 2 weeks, then 20 mg/day for 2 weeks
Always have your PCT drugs on hand before you even start your S-23 cycle. Using a natural testosterone booster after the SERM protocol can provide additional support.
Yes, S-23 can be very effective for cutting. Its ability to promote lean mass and strength helps preserve muscle tissue in a calorie deficit, and it provides a dry, hard look since it does not aromatize. However, its significant suppression can sometimes lead to low-energy levels, which might be counterproductive during a cut. Stacking it with a non-suppressive energizing compound like Cardarine (GW501516) can help mitigate this issue and enhance fat loss.
S-23 is not a 17-alpha-alkylated compound, so it is not considered significantly liver-toxic like oral steroids. However, some users may still show slight elevations in liver enzymes on blood tests, as the liver processes most foreign substances. This hepatotoxicity is generally much milder than that of compounds like Anadrol or Superdrol. Using liver support like TUDCA or NAC is still a wise precautionary measure.
Both are very powerful SARMs, but S-23 is generally considered to be more suppressive and slightly more anabolic. RAD 140 (Testolone) is known for providing exceptional strength gains and dry, hard muscle with significant suppression. S-23 often produces more noticeable mass gains and is also highly androgenic, potentially leading to more side effects like hair loss. S-23 is for users who have experience with other SARMs and are seeking the strongest possible results, accepting the harsher suppression.
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Manufacturer: Dragon Pharma
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Pack size: 100 tablets
Route: Oral
Lab Test: View Result
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Form/Strength: Tablet, 25 mg
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Lab Test: View Result
Classification: SARM (Selective Androgen Receptor Modulator)
Active substance: Mastorin (S-23)
Manufacturer: Dragon Pharma
Form/Strength: Tablet, 10 mg
Pack size: 100 tablets
Route: Oral
Lab Test: View Result
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Form/Strength: Tablet, 10 mg
Pack size: 100 tablets
Route: Oral
Lab Test: View Result