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Systematic (IUPAC) name
(8R,9S,10R,13S,14S,17S)-17-Hydroxy-10,13-dimethyl-6,7,8,9,10,11, 12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-3-one
Clinical data
AHFS/ International Drug Names
Legal status
Routes of
Pharmacokinetic data
Biological half-life 14 days
CAS Number 846-48-0 YesY
ATC code None
PubChem CID 13308
DrugBank DB01541 YesY
ChemSpider 12744 YesY
ChEBI CHEBI:34584 YesY
Chemical data
Formula C19H26O2
Molar mass 286.409 g/mol
Physical data
Melting point 165 °C (329 °F)
 NYesY (what is this?)  (verify)

Boldenone (1,4-androstadiene-3-one-17β-ol, also known under the trade names Equipoise, Ganabol, Equigan and Ultragan) is an anabolic steroid. It is often formulated as the undecylenate ester.

Effects and side-effects[edit]

The activity of boldenone is mainly anabolic, with a low androgenic potency. Boldenone will increase nitrogen retention, protein synthesis, increases appetite and stimulates the release of erythropoietin in the kidneys.[medical citation needed] Boldenone was synthesized in an attempt to create a long-acting injectable methandrostenolone (Dianabol), for androgen deficiency disorders. Boldenone acts similar to methandrostenolone with less adverse androgenic effects.[medical citation needed] Although commonly compared to nandrolone, boldenone lacks progesterone receptor interaction and all the associated progestogenic side effects.

Use in sports[edit]


Boldenone is among the substances banned by Major League Baseball, as well as most other major athletic organizations.

Los Angeles Angels minor league outfielder Reynaldo Ruiz in September 2010[1] and Philadelphia Phillies minor league pitcher San Lazaro Solano in January 2011[2] each received a 50-game suspension for the 2011 season as a result of testing positive for a metabolite of boldenone.

Mixed martial arts[edit]

Stephan Bonnar and Josh Barnett, mixed martial arts (MMA) fighters from the UFC and PRIDE Fighting Championships, have also tested positive for the banned substance.[3] After the World Extreme Cagefighting show on January 20, 2006 Muay Thai turned MMA fighter Kit Cope also tested positive for Boldenone.[4] Following the Strikeforce card on June 22, 2007 former PRIDE and UFC fighter Phil Baroni tested positive for Boldenone, as well as Stanozolol.[5] At a K-1 WGP event in Las Vegas on August 17, 2007 two fighters, Rickard Nordstrand and Zabit Samedov, both tested positive for Boldenone.[6] Alexandre Franca Nogueira has tested positive for boldenone in July 2008.[7]

Antonio Silva tested positive for Boldenone after his July 26, 2008 fight against Justin Eilers in the EliteXC promotion. Silva was suspended by the California State Athletic Commission for a year and fined $2500.[8]

Australian Football League[edit]

Justin Charles, a former minor league baseball player with the Florida Marlins, of Richmond FC tested positive for the substance in 1997 and was suspended for 16 matches.[9]

Major League Soccer[edit]

Jon Conway (goal keeper) and Jeff Parke (defender) of the New York Red Bulls both tested positive for the substance in 2008 and were suspended 10 games and fined 10% of their annual income. They are also the first to abuse MLS drug policy.[10]

Horse racing[edit]

Leading horse trainer Gai Waterhouse has been fined $10,000 after being found guilty on the 15th of May 2008 of presenting a horse to the races with a prohibited substance in its system. Her horse Perfectly Poised was found to have traces of the banned substance boldenone in its system after finishing second at Canterbury in April 2007.[11]

See also[edit]