- -15%
Package:10mg / 60 capsules
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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.
Product dosage:Â 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:Â Up to 30 mg per day
Used by experienced athletes, but increases the risk of natural testosterone suppression.
When to take:
How long to take:
Because S23 is considered a more aggressive SARM profile, potential side effects may include:
S23 binds to androgen receptors, primarily targeting muscle and bone receptors, promoting:
Due to its potency, S23 is also commonly associated with stronger suppression of the body’s natural testosterone production compared to “entry-level” SARMs.
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:
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.