Mastorine 10mg – S23

A product belonging to the SARM family

Shipping (if the product is in stock): 3 business days for processing and 5 to 20 business days for shipping
Processing and shipping costs: €27 throughout Italy

Available payment methods: Bitcoin - Bank transfer - Credit card - Neteller

A Brief Overview of Mastorine (S23)
Mastorine, also known as S23, is considered one of the most potent SARMs available for building lean muscle mass and increasing strength. It produces an extremely hard, dry, and veiny appearance, making it highly sought after during advanced body recomposition phases.
Compared to other SARMs, however, Mastorine (S23) exhibits the highest level of testosterone suppression, a factor that makes it suitable only for experienced and knowledgeable users.

What is Mastorine (S23)?

S23 is a next-generation SARM developed based on the structure of a previous compound, C-6, which is considered less effective. The main chemical modification involves replacing the para-nitro group on C-6 with a cyano group.
This change has led to a significant improvement in pharmacokinetics: while C-6 had an oral bioavailability of approximately 76%, Mastorine (S23) achieves up to 96% oral bioavailability, making it extremely effective even at low doses.

Research

Mastorine (S23) is currently in the preclinical development phase and has been studied exclusively in animal models.
Research has shown that S23 is the most potent SARM ever tested, inducing total infertility in treated rats. For this reason, it is of scientific interest as a potential male hormonal contraceptive.
To date, there have been no clinical studies in humans.

Opinions of Users of Doping Substances

In the world of bodybuilding, Mastorine (S23) is becoming increasingly popular for its extremely potent effects on muscle mass and definition
Many users consider it a more potent version of Andarine (S4), without the visual side effects typical of the latter.
Some studies suggest a possible reduction in prostate size, but this effect is common to many SARMs and is dose-dependent, so it is often misunderstood.

Main effects

Extremely effective in building lean muscle mass
Significant increase in strength and performance
A lean, dense, and highly defined physique
Improvements in Productivity and Training Intensity

Side effects

Very marked suppression of endogenous testosterone
Anecdotal reports of insomnia, irritability, and nervousness, similar to those observed with trenbolone

Effect on the liver

There are currently no specific studies on the hepatotoxicity of Mastorine (S23)
. Although it is the most potent SARM, from a chemical standpoint it should be less toxic to the liver than YK-11, as it has fewer methylated groups.

Testosterone suppression

Mastorine (S23) is universally considered the most testosterone-suppressive SARM currently available.
Its use therefore requires very careful planning and appropriate support strategies.