Testosterone is derived from the androgen called androstenedione via a reduction of its 17-keto group.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Certain adrenal tumors cause elevated levels of androstenedione which is converted by the enzyme aromatase into estrone, a form of estrogen.    From Wordnik.com.  [Find Me A Cure] Reference

The report talks about negative health effects of androstenedione.    From Wordnik.com.  [Is Today Mark McGwire’s Best Day in Years? - Freakonomics Blog - NYTimes.com] Reference

DHEA, as it happens, is converted in the body to ... androstenedione.    From Wordnik.com.  [Toxic Strength] Reference

But still, no one knows exactly how -- or if -- androstenedione works.    From Wordnik.com.  [Mcgwire's Power Supply] Reference

FIRFER: The other supplement targeted by the FDA androstenedione, or andro.    From Wordnik.com.  [CNN Transcript Mar 20, 2004] Reference

McGwire readily admitted that he's been using androstenedione for the last year.    From Wordnik.com.  [Mcgwire's Power Supply] Reference

During the mid 90's, McGwire was open about his use of the steroid precursor, androstenedione, or.    From Wordnik.com.  [Larry Abrams: Bonds -- In and Outta This World] Reference

ROBERTS: So what he said goes way beyond the androstenedione that he had already admitted to taking?.    From Wordnik.com.  [CNN Transcript Jan 12, 2010] Reference

As Linkmeister and Dr X point out, Mark McGwire was indeed up front about his use of androstenedione.    From Wordnik.com.  [A decade in the rough] Reference

Dehydroepiandrosterone (DHEA) and androstenedione ( "andro") are weaker androgens that decline with age.    From Wordnik.com.  [Men's Health: Controversies And Clear Thinking] Reference

An alert reporter noticed a bottle of the muscle-building supplement androstenedione in McGwire's locker.    From Wordnik.com.  [Mcgwire's Power Supply] Reference

In 1998, McGwire admitted to using androstenedione, which has since been banned by Major League Baseball.    From Wordnik.com.  [Cooperstown results day: McGwire may come up short] Reference

And it wasn't until Mark McGwire was found that he had androstenedione in his locker that that even came out.    From Wordnik.com.  [CNN Transcript Dec 12, 2004] Reference

OSBORNE: Well, primarily steroid precursors, androstenedione, which was popularized by Mark McGwire and others.    From Wordnik.com.  [CNN Transcript Nov 8, 2003] Reference

Ted Riley, a Little League coach in Emmetsburg, Iowa, isn't worried that his players will rush out to buy androstenedione.    From Wordnik.com.  [Mcgwire's Power Supply] Reference

Data are scarce, but one unpublished study suggests that androstenedione use boosts testosterone by no more than 15 percent.    From Wordnik.com.  [Mcgwire's Power Supply] Reference

Asking your trainer to inject you with deca-durabolin or androstenedione, to name two illegal steroids, is against the rules.    From Wordnik.com.  [Erica Boeke: A-Rod's Scarlet Letter: Does it Really Matter?] Reference

In 1998, Steve Wilstein of the Associated Press wrote about observing a bottle of androstenedione in slugger Mark McGwire's locker.    From Wordnik.com.  [Robert Lipsyte: The Literature of Betrayal Arrives at the Ballpark] Reference

Some ingredients on our high-risk list include androstenedione and bitter orange, found in supplements used to boost athletic performance.    From Wordnik.com.  [FDA: Stop using body-building products that make steroid-like claims] Reference

In 1999, even after McGwire had copped to taking androstenedione - or.    From Wordnik.com.  [TIME.com: Top Stories] Reference

So I switched him over to androstenedione, which kept the testosterone levels up.    From Wordnik.com.  [Deadspin] Reference

So we know McGwire was on androstenedione (which is a pro-hormone) in 1998 while he broke Roger Maris's record.    From Wordnik.com. Reference

In 1998, there was a bottle of androstenedione lurking in the back of Mark McGwire's locker during TV interviews.    From Wordnik.com.  [YubaNet.com] Reference

In colts, testosterone and androstenedione were the most commonly detected androgens at concentrations of more than 125 pg/mL.    From Wordnik.com.  [Thoroughbred News | BloodHorse.com] Reference

He cops to using amphetamines as well as androstenedione, when they were legal, even though he was warned about risks to his health.    From Wordnik.com. Reference

Adams contends he once found a box labeled "Andro" in Armstrong's house - a term used to describe androstenedione, a banned steroid.    From Wordnik.com.  [NYT > Home Page] Reference

During the much-celebrated pursuit of Maris 'record, a bottle of the steroid precursor androstenedione was spotted in McGwire's locker.    From Wordnik.com.  [STLtoday.com Top News Headlines] Reference

McGwire’s name appears several times in the report, in the context of his (admitted) use of androstenedione, which was legal at the time.    From Wordnik.com.  [Is Today Mark McGwire’s Best Day in Years? - Freakonomics Blog - NYTimes.com] Reference

Andro (androstenedione)/DHEA.    From Wordnik.com.  [USATODAY.com - Steroids can build muscles, shrink careers] Reference

He admitted to androstenedione.    From Wordnik.com.  [CNN Transcript Aug 6, 2007] Reference

"Before menopause, the ovaries make a lot of estrogen, plus androgens including testosterone and androstenedione.    From Wordnik.com.  [Health News from Medical News Today] Reference