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S23 10 mg

Potent Selective Androgen Receptor Modulator (SARM)

Lab Tested

Substance: Mastorin (S-23)
Strength: 10 mg/tablet
Form: Oral tablets
Packaging: 100 tablets
Manufacturer: Dragon Pharma, Europe

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Dragon Pharma S23 (Mastorin)

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:

Rapid Lean Mass Accretion: Drives substantial increases in muscle protein synthesis, facilitating the addition of dense, quality lean tissue with minimal water retention.
Enhanced Fat Loss & Metabolism: Increases basal metabolic rate (BMR) and promotes a shift in fuel utilization, helping to strip stubborn body fat and improve muscle definition.
Superior Strength & Power Output: Noticeable boosts in gym performance, work capacity, and one-rep max strength, allowing for more intense and productive training sessions.
Improved Muscle Hardness & Density: Contributes to a dry, granite-like muscle quality and enhanced vascularity, perfect for pre-contest preparation or achieving a peeled look.
Potent Androgenic Activity: Offers strong receptor activation for pronounced anabolic effects, making it a top choice for experienced users seeking powerful results.

Each sachet contains 100 tablets of 10mg Mastorin (S-23), manufactured under strict quality control standards in Dragon Pharma's certified facilities.

Product Specifications

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)

Usage Guidelines

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.

Beginner Cycle (6 weeks): 10-15 mg per day, split into two doses (e.g., morning and evening). A first cycle should not exceed 6 weeks to assess tolerance and suppression. A full PCT with Clomid or Nolvadex is mandatory.
Intermediate Cycle (8 weeks): 15-20 mg per day, split into two doses. Users with prior SARM/AAS experience may run this cycle. Support with a liver aid like Atorvastatin or TUDCA is advised. PCT is critical.
Advanced Cycle (8 weeks): 20-30 mg per day, split into two doses. Reserved for very experienced athletes. Often stacked with a testosterone base like Cypionat 250 to mitigate suppression. Requires comprehensive on-cycle support and aggressive PCT.

Post Cycle Therapy (PCT):

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.

Liver Protection & On-Cycle Support:

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.

Third-Party Lab Tested

Dragon Pharma S23 Lab Test Report April 18 2025

2025-04-18

View Result

12.43 mg

Dragon Pharma S23 Lab Test Report January 3 2024

2024-01-03

View Result

9.97 mg

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.

Storage Instructions

To maintain the stability, potency, and shelf-life of your Dragon Pharma S23 (Mastorin) tablets, please adhere to the following storage guidelines:

Environment: Store in a cool, dry place away from direct sunlight, heat sources (like radiators), and moisture (like bathrooms).
Temperature: Ideal storage temperature is between 15°C and 25°C (59°F and 77°F). Avoid freezing or excessive heat.
Container: Keep the tablets in their original, sealed Dragon Pharma sachet until use. The sachet provides a barrier against light, air, and humidity.
Safety: Keep out of reach of children and pets. Do not store with food or beverages to prevent accidental ingestion.
Shelf Life: When stored properly, the product will maintain optimal potency for up to 3 years from the date of manufacture. Do not use if the sachet is torn or compromised.

What is S-23 good for?

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.

Is Dragon Pharma S23 a SARM or a steroid?

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).

What is the typical dosage for S23?

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.

Do I need Post Cycle Therapy (PCT) after using S23?

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.

How do Dragon Pharma's lab tests verify S23 quality?

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.

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