Mastorine 10mg (S23) — Powerful SARM for Recomposition, Strength and Hardness

Mastorine (S23) is a highly potent Selective Androgen Receptor Modulator (SARM) known for strong anabolic activity and a “dry”, dense look in physique-oriented use. S23 is often associated with increases in strength, muscle hardness, and overall body recomposition (muscle retention/gain with fat reduction), making it popular among advanced users looking for a more aggressive SARM profile than mild compounds.

S23 works by binding to androgen receptors in muscle tissue, stimulating anabolic signaling. Compared to milder SARMs, S23 is commonly described as more suppressive, which is why recovery and monitoring are typically emphasized.

Who can benefit from Mastorine (S23)?

• ✔ If you want a harder, denser physique — S23 is often used for a “dry” look and muscle hardness.
• ✔ If you want strength progression — users typically choose S23 when the goal is noticeable performance increase.
• ✔ If you are cutting and want to retain muscle — S23 is commonly used to preserve muscle during fat loss phases.
• ✔ If you want aggressive recomposition — often positioned as a stronger option than mild SARMs.

How to take Mastorine (S23) correctly?

Product dosage: 10 mg per capsule.

Recommended dosage: 10–20 mg per day
Suitable for most users, it provides significant gains in strength, muscle hardness, and fat loss.

Maximum dosage: Up to 30 mg per day
Used by experienced athletes, but increases the risk of natural testosterone suppression.

When to take:

• Once daily, as S23 has a long duration of action.
• Can be taken in the morning or 30–60 minutes before training if the goal is to enhance training performance.

How long to take:

• 6–8 weeks is the optimal cycle length.
• After the cycle, it is recommended to take a break of at least 4 weeks and perform a mandatory post-cycle testosterone test (PCT), as S23 significantly suppresses natural testosterone.

Side Effects

Because S23 is considered a more aggressive SARM profile, potential side effects may include:

• stronger testosterone suppression and hormonal imbalance symptoms
• mood changes (irritability/aggression in some users)
• acne or skin irritation
• hair shedding in genetically predisposed individuals
• potential negative changes in lipids (HDL/LDL)
• possible liver stress in sensitive individuals

How does Mastorine (S23) work?

S23 binds to androgen receptors, primarily targeting muscle and bone receptors, promoting:

• increased muscle protein synthesis
• improved nitrogen retention
• enhanced strength output and training performance
• improved muscle retention during calorie deficits

Due to its potency, S23 is also commonly associated with stronger suppression of the body’s natural testosterone production compared to “entry-level” SARMs.

Impact on Natural Testosterone Levels

Since this compound is a SARM, it can suppress natural testosterone production in the body. SARMs bind to androgen receptors in muscle and other tissues, stimulating anabolic activity while signaling the body to reduce its own testosterone production. This can lead to lower testosterone levels both during and after using these substances.

The suppression of testosterone can cause several issues, including:

• decreased libido and energy levels
• mood swings, irritability, depression
• loss of muscle mass or strength after the cycle ends
• reduced motivation and fatigue

How to Prevent Low Testosterone Levels

1. Use of SERMs (Selective Estrogen Receptor Modulators)
   SERMs like Clomiphene (Clomid) or Enclomiphene stimulate LH and FSH production, restoring testosterone.
2. Physiological Testosterone Replacement
   Small physiological doses of testosterone can temporarily support hormone levels during recovery.
3. HCG (Human Chorionic Gonadotropin)
   HCG directly stimulates the testes to produce testosterone by mimicking LH.

How to Manage Cycle

It’s essential to monitor blood tests regularly to track hormone levels and reduce the risk of side effects. Supplements supporting liver health, lipid balance, and joint function can also be highly beneficial during the cycle.

Post-Cycle Therapy (PCT) is essential after completing a cycle of SARMs or other performance-enhancing substances. SERMs like Clomiphene or Tamoxifen should be used to restore natural testosterone production and prevent hormonal imbalance.