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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 Registry 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
Molecular mass 286.409 g/mol
Physical data
Melting point 165 °C (329 °F)
 N (what is this?)  (verify)

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

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. Tampa Bay Rays pitcher Alex Colome was suspended 50 games for testing positive for boldenone on March 24, 2014. Jenrry Mejia was suspended 162 games for testing positive for Stanozolol and Boldenone on July 28, 2015.

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] Most recently, 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] It was also announced on August 21, 2008, that EliteXC Heavyweight Champion Antônio "Bigfoot" Silva tested positive for the banned substance prior to his fight and victory over Justin Eilers.[citation needed]

Alexandre Franca Nogueira has tested positive for the anabolic steroid Boldenone, the California State Athletic Commission said Monday in a statement, on July 7, 2008.[7]

Antônio "Bigfoot" Silva tested positive for boldenone metabolites following his title-winning victory over Justin Eilers at “Unfinished Business” on July 26.[citation needed]

On Aug. 21, Silva was issued a yearlong suspension and $2,500 fine after his post-fight urine samples were returned from a World Anti-Doping Agency approved laboratory in Montreal, Canada.[citation needed]

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.[8]

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.[9]


Former three time champion James Toney tested positive for boldenone and stanozolol after a May 24 fight.[citation needed] Toney also tested positive for stanozolol two years ago after a fight with John Ruiz costing him the World Boxing Association (WBA) heavyweight championship.[citation needed]

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.[10]

See also[edit]


  1. ^ "Three Minor League players suspended". September 30, 2010. 
  2. ^ "Phillies Minor League Pitcher San Lazaro Solano Suspended". January 20, 2011. 
  3. ^ Ivan Trembow (2006-11-06). "Bonnar Suspended 9 Months for Steroid Use". Retrieved 2007-07-03. 
  4. ^ Josh Gross (2007-01-20). "Update: Cope Tests Positive for Steroids". Retrieved 2007-07-03. 
  5. ^ Ken Pishna (2007-07-03). "Breaking News: Phil Baroni Tests Positive". Retrieved 2007-07-03. 
  6. ^ Brent Brookhouse (2007-08-17). "Two More Positive Drug Tests In Fight World". Archived from the original on September 30, 2007. Retrieved 2007-08-17. 
  7. ^
  8. ^
  9. ^
  10. ^,,23705361-421,00.html.  Missing or empty |title= (help)[dead link]