In fact, GW1516 has not shown any significant side effects. There is no hormones suppression, no toxicity and no other common side effects. The only thing that should be noted is that GW1516 significantly activates metabolism and contributes to the rapid consumption of glycogen during exercises, so do not exceed recommended dosages; otherwise signs of hypoglycemia (weakness, drowsiness, hunger, muscular cramps, in severe cases - loss of consciousness) may occur. If you feel some of these signs, immediately eat something sweet (containing fast carbs).
It shall be noticed, that in men, approximately 5% of testosterone undergoes 5α-reduction to form the more potent androgen, dihydrotestosterone (DHT), also known as androstanolone. From another side approximately % of testosterone is converted into estradiol (the primary female sex hormone) by aromatase an enzyme expressed in the brain, liver, and adipose tissues. Hence, don`t forget to take precautions to avoid respective side effects. Thereof we recommend to perform blood works and take aromatase inhibitors on cycle (if required, anastrozole preferably) and SERMs (clomifene, toremifene) during post cycle therapy (PCT).