MYO-S4 (Andarine S4)


Advantages Of S4 when compared to Steroids/Prohormones

  • S4 is nontoxic and has no negative effect on the liver, blood pressure or any other internal organs
  • There’s no need for full post cycle therapy, just a 2 week rest period between cycles
  • Greater sense of well being while on S4
  • S4 provides steroid like results without the steroid like side effects
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S4 is a lean body mass builder, as well as strength and vascularity enhancer. S4 is categorised as a SARM but was initially designed to treat several severe medical conditions such as muscle wasting, osteoporosis and benign pro-static hypertrophy. It has been effective with this as it uses the non-steroidal androgen antagonist bicalutamide as a lead compound. Compared to testosterone and other forms of steroids, the advantages of S4 is that it does not have androgenic activity in non-skeletal muscles. S4 is often thought of as the strongest SARM in terms of the many capabilities it has.


S4 binds to the AR in muscle and bone at a third of the affinity as testosterone.

SARMS themselves bind to the AR (androgen receptor) and demonstrate osteo (bone) and myo (muscular) anabolic activity. When something binds and activates the AR it alters the expression of genes and increases protein synthesis which as a result builds muscle. SARMS cause muscle growth in the same method as steroids however the difference is that SARMS does not enhance the growth of ones prostate and affect other sexual organs. They do not cause the many problems that anabolic can cause, they don’t have the toxicity and in some circumstances only cause minimal suppression which allows for a rapid recovery. Steroids can cause long term problems from the high rates of suppression and unlike SARMS, they can actually reduce the sense of well being each day.


S4 provides huge amounts of strength, stamina and aides in rapid recovery. There is no estrogen conversion, no water retention or bloat and no toxicity. Thanks to its anabolic nature, the strength gains come rapidly but lean mass gains is the primary target from use.




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