What does androstenedione mean?
Androstenedione is a steroid hormone produced naturally by the adrenal glands, ovaries, and testes, where it serves as a crucial intermediate step in the body's manufacture of both testosterone and estrogen. Chemically designated as 4-androstenedione, it belongs to the class of hormones known as androgens, although it has only weak masculinizing activity on its own. The word entered public consciousness in 1998 when baseball player Mark McGwire was reported to be using it as a dietary supplement during his record-setting home-run season. This publicity prompted scrutiny from regulators, and in the United States the Anabolic Steroid Control Act of 2004 reclassified androstenedione as a controlled substance, ending its legal sale as a supplement. Today the term appears mainly in medical, biochemical, and anti-doping contexts — in blood panels assessing adrenal function, in discussions of congenital adrenal hyperplasia, and in forensic analyses of athletic drug testing. It remains a useful word precisely because it bridges laboratory science and high-profile sports history.
nounA naturally occurring steroid hormone produced in the adrenal glands and gonads, acting as a precursor in the biosynthesis of testosterone and estrogen.
- Biochemistry/physiology: a C19 steroid hormone (4-androstenedione), produced chiefly in the adrenal cortex and gonads, that functions as an intermediate in the synthesis of testosterone and estrogens.
- Pharmacology/sports: the synthetic or supplemental form of this hormone, formerly marketed as a dietary supplement for muscle building before being classified as a controlled anabolic steroid in several countries, including the United States.
"The athlete's elevated androstenedione levels suggested supplementation with a banned precursor steroid."
"Blood tests revealed abnormally high androstenedione concentrations, pointing to possible adrenal dysfunction."
"After the 2004 Anabolic Steroid Control Act revision, androstenedione could no longer legally be sold over the counter in American supplement stores."
Rarely used; appears almost exclusively in scientific literature referring to multiple distinct chemical variants or multiple measured values of the hormone across samples or timepoints.
"The assay compared androstenediones extracted from serum samples collected over the full menstrual cycle."
In 1998, a bottle of androstenedione spotted in Mark McGwire's locker made this obscure steroid one of the most talked-about words in sports — and helped spark baseball's crackdown on performance-enhancing substances.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does androstenedione come from?
The word combines Greek 'andros' meaning 'man' with the chemical suffix '-edione' indicating a ketone-containing compound derived from an unsaturated hydrocarbon framework. It was coined in the early twentieth century by chemists working to characterize steroid hormones following Adolf Butenandt's pioneering isolation of sex hormones in the late 1920s and early 1930s, work for which Butenandt later received the Nobel Prize. Related terms sharing the same Greek root include 'androgen', 'androgenic', and 'androgynous'.
Related word forms
How androstenedione is actually used
Androstenedione is a technical term used primarily in endocrinology, sports medicine, doping-control contexts, and biochemistry. It carries no informal register and is rarely used outside these domains. Because of its association with performance-enhancing drug scandals of the late 1990s and early 2000s, the word often carries connotations of doping controversy. In clinical literature it is frequently abbreviated as 'AED' or 'ASD' alongside other steroid measurements, though readers should note such abbreviations are context-dependent.
Easily confused with androstenedione
Androstenedione is a weaker precursor hormone that the body converts into testosterone, whereas testosterone is the primary active male sex hormone itself.
DHEA (dehydroepiandrosterone) is another adrenal steroid that serves as a precursor to androstenedione, sitting one step earlier in the hormone pathway.