Contents Andarine (S4) Review Strength Endurance Fat Loss Side Effects 4.8  What is Andarine? Andarine (S4) was developed by GTX Inc. for the treatment of muscle wasting, osteoporosis and BPH (enlargement of the prostate). It belongs to the class of drugs called SARM’s – selective androgen receptor modulators. Today, it is popularly used and sold as a research chemical, which is used by athletes who seek to get all of the strength benefits and lean muscle gains without the harmful side effects observed with anabolic steroids. Moreover, andarine is also used as part of steroid stacks to improve a … Continue reading Andarine (S4)