Potent Selective Androgen Receptor Modulator (SARM)
S23 10 mg, pharmaceutical name Mastorin, stands at the pinnacle of Selective Androgen Receptor Modulator (SARM) technology. Engineered for the dedicated bodybuilder and performance athlete, S23 is renowned for its exceptional anabolic potency and ability to promote dramatic physical recomposition. Unlike weaker SARMs, S23 exhibits a strong binding affinity to the androgen receptor, triggering effects that closely mirror traditional anabolic steroids, such as significant increases in lean muscle tissue, raw strength, and metabolic rate, but with a more targeted tissue selectivity in its ideal profile.
This product is formulated for those seeking beyond-incremental results. Each 10 mg tablet of Dragon Pharma's Mastorin is produced in EU-certified facilities under cGMP standards, ensuring pharmaceutical-grade purity, accurate dosing, and batch-to-batch consistency. The compound's primary mechanism drives nitrogen retention and protein synthesis in skeletal muscle while promoting lipolysis (fat breakdown), creating the ideal environment for a dry, hard, and vascular physique. It is particularly effective during cutting phases to preserve hard-earned muscle under caloric deficit or during lean-bulking cycles to add quality mass without excessive water retention.
Understanding the compound's potency is crucial. S23 is among the most suppressive SARMs available, significantly impacting the hypothalamic-pituitary-testicular axis (HPTA). This makes a meticulously planned cycle duration and a mandatory, robust Post Cycle Therapy (PCT) non-negotiable for restoring natural endocrine function. Dragon Pharma provides transparent, third-party lab verification for this product, giving athletes confidence in the authenticity and superior potency of every sachet.
Key Benefits:
Each sachet contains 100 tablets of 10mg Mastorin (S-23), manufactured under strict quality control standards in Dragon Pharma's certified facilities.
| Product Name | S23 10 mg |
| Manufacturer | Dragon Pharma |
| Substance | Mastorin (S-23) |
| Packaging | 100 tablets in sealed sachet |
| Lab Test Result | 12.43 mg (Apr 2025), 9.97 mg (Jan 2024) |
| Half-Life | Approximately 6–12 hours |
| Recommended Cycle | 6–8 weeks |
| Form | Oral tablet |
| Aromatization | No (Non-estrogenic) |
| Dosage (Men) | 10–30 mg per day (split doses) |
S23 (Mastorin) is a powerful compound that demands respect and careful planning. Due to its potent androgenic activity and significant suppressive nature, these guidelines are for informational purposes only. Always consult with a healthcare professional and consider pre- and post-cycle blood work.
Begin PCT 24 hours after your last S23 dose due to its short half-life. A typical 4-week protocol: Week 1-2: Clomid at 50 mg/day or Nolvadex at 40 mg/day. Week 3-4: Clomid at 25 mg/day or Nolvadex at 20 mg/day. For more robust recovery, some add a low dose of Aromasin if estrogen rebound is a concern. Blood work confirmation 4-6 weeks after PCT is the only way to verify full HPTA recovery.
While S23 is not extensively hepatotoxic like some oral steroids, its androgenic load stresses the body. Incorporate a quality liver support supplement (NAC, TUDCA, Milk Thistle). Monitor blood pressure and cholesterol, as S23 can negatively impact lipid profiles. A cardio-support agent like GW501516 may be beneficial. Stay hydrated and maintain a liver-friendly diet.
Note: Lab tests verify the actual active substance content per tablet. Dragon Pharma's consistent overdosing beyond the 10 mg label claim ensures guaranteed potency for the user.
To maintain the stability, potency, and shelf-life of your Dragon Pharma S23 (Mastorin) tablets, please adhere to the following storage guidelines:
S-23, also known as Mastorin, is a potent selective androgen receptor modulator (SARM) favored by athletes and bodybuilders for its significant anabolic effects. It is used to promote rapid lean muscle mass gains, increase strength and power output, accelerate fat loss, and improve muscle density and hardness. Its androgenic properties also make it effective for enhancing athletic performance and physical conditioning.
Dragon Pharma S23 (Mastorin) is classified as a Selective Androgen Receptor Modulator (SARM). It is designed to selectively target androgen receptors in muscle and bone tissue, mimicking some effects of anabolic steroids but with a more targeted action. However, it is a potent compound with strong androgenic activity and can cause significant suppression of natural testosterone, requiring a structured Post Cycle Therapy (PCT).
Dosage for S23 is highly individual and experience-dependent. Beginners often start with 10-15 mg per day for 6-8 weeks. Intermediate users may use 15-20 mg daily, while advanced bodybuilders sometimes use up to 25-30 mg per day. Due to its potent nature and short half-life (approximately 6-12 hours), it is typically split into two daily doses. It is crucial to start with the lowest effective dose and never exceed recommended cycles.
Yes, a Post Cycle Therapy (PCT) is absolutely essential after a cycle of S23. It is one of the most suppressive SARMs and can severely lower natural testosterone production. A standard PCT begins 24 hours after the last dose and typically includes a SERM like Dragon Pharma's Clomid or Nolvadex for 4 weeks. Blood work before, during, and after the cycle is highly recommended to monitor hormone recovery.
Dragon Pharma subjects its S23 (Mastorin) to regular, independent third-party laboratory testing. The results, publicly available on the product page, verify the exact active substance content against the stated label claim. For example, the latest test from April 2025 showed a result of 12.43 mg per tablet, exceeding the 10 mg label claim, demonstrating consistent overdosing for guaranteed potency and product integrity.