The use of anabolic-androgenic steroids brings many undesirable side effects. Most often we can notice them during the period after the therapy is completed. Use of PCT supplements will not only be an effective tool for keeping a lean body mass, muscle strength and endurance or aerobic capacity, but also helps for a safe return to optimal health. Use of a complex of many substances will provide the start of work for axis pituitary – subthalamus - adrenal axis, thereby the synthesis of endogenous testosterone, growth hormone and IGF-1. PCT supplements are also an effective way to minimize the risk of anti-estrogen gynecomastia, excessive hydration or decrease in lean body mass. It is also worth to notice, that the use of post-cycle therapy will provide a well-being and help not only to return to optimal health, but also to achieve the successive goals of the training.