Creatine is a well-known way of improving body efficiency for decades and is definitely the most popular supplement used. It is especially needed for athletes, thanks to which they can increase the body's capacity. Creatine occurs naturally in the body, however, oral administration in the form of supplements, significantly increases its share in muscle tissue. Adequate dosage of creatine stimulates protein synthesis, which translates into accelerated muscle mass gain. Consequently, people are able to noticeably improve their physical abilities. In addition, the antioxidant effects of creatine have been proven, as well as the recovery of damaged muscle fibers. This substance also accelerates the wound healing process. All these benefits were noticed initially, mainly by bodybuilders who popularized creatine. With time, however, also people who were not related to strength sports, became aware of the benefits of this supplement, which was popularized in the whole broadly understood sport. Creatine is considered a safe supplement, as evidenced by numerous scientific studies. However, in order to maximize its activity, it should be dosed properly and used in conjunction with the training cycle. Thanks to this, it will be possible to achieve maximum benefits from using creatine. This popular supplement is intended mainly for athletes and physically active people.