Steroids are a class of organic compounds with a characteristic structure of four cycloalkane rings fused. They are found in nature, such as plants, animals, and fungi. Some steroids, such as cholesterol, are important cell membrane components and essential for various biological processes.

In addition to their natural occurrence, synthetic steroids, also known as anabolic steroids, are often used to enhance athletic performance and promote muscle growth. These steroids mimic the effects of the male sex hormone testosterone, which is responsible for muscle development and can be taken orally or injected into the body.

However, using anabolic steroids without a prescription can have serious health consequences, including liver damage, cardiovascular disease, and mood disorders. Moreover, anabolic steroids are often associated with some ethical and legal issues in sports.