S4 is a very powerful SARM known for its effects on muscle mass and bone strength. Originally created by GTx as a potential treatment for muscle wasting disorders, it was ultimately discontinued due to adverse effects related to vision and eyesight. It has a bright yellow appearance in both powder and solution form.

You can learn all about S4 in the articles below.

Andarine / S4 is best for:

  • Shredding up during a cutting cycle
  • Muscle hardness and vascularity
  • Retaining muscle during a cut

60 %
Side effects
55 %