A steroid is a drug that helps a person do better in areas such as sports, as well as give them more physical strength. Often, steroids are used to improve a person's performance, but they are sometimes overused and abused by athletes that depend on steroids. The rate of steroid abuse has grown by a high percentage in the last few years, and people all over the world continue to use them. Steroids can have very bad effects on the human body . The substances that are steroids for vertebrates are either hormones , or cholesterol . Steroids can kill people, and they have many side effects for both men and women. They are common in sports , but also in other areas. But is illegal for some sports.
Transdermal patches (adhesive patches placed on the skin) may also be used to deliver a steady dose through the skin and into the bloodstream. Testosterone-containing creams and gels that are applied daily to the skin are also available, but absorption is inefficient (roughly 10%, varying between individuals) and these treatments tend to be more expensive. Individuals who are especially physically active and/or bathe often may not be good candidates, since the medication can be washed off and may take up to six hours to be fully absorbed. There is also the risk that an intimate partner or child may come in contact with the application site and inadvertently dose himself or herself; children and women are highly sensitive to testosterone and can suffer unintended masculinization and health effects, even from small doses. Injection is the most common method used by individuals administering AAS for non-medical purposes.