Androstenedione is a type of chemical known as an anabolic steroid. It is converted in the body to other sex hormones, including testosterone and estrogen.
Androstenedione is naturally made in the body. Most androstenedione comes from the testes, ovaries, and adrenal glands. The body begins to make less androstenedione after the age of 30.
People use androstenedione for muscle strength, athletic performance, erectile dysfunction, fatigue, and many other conditions, but there is no good scientific evidence to support these uses. It might also be unsafe.
In the US, androstenedione is a schedule III controlled substance that is not legal for use in supplements. But it is still found in some supplement products, especially those marketed for muscle strength and athletic performance. It is also banned by the National Collegiate Athletic Association (NCAA). Don't confuse androstenedione with other compounds, including 1-androsterone, 4-androsterone, androstenediol, androstenetrione, androsterone, 1-epiandrosterone, and epiandrosterone. These are not the same.
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