Boldenone (developmental code name RU-18761), is a naturally occurring anabolic–androgenic steroid (AAS) and the 1(2)-dehydrogenated analogueoftestosterone.[3][4][5][6][7] Boldenone itself has never been marketed; as a pharmaceutical drug, it is used as boldenone undecylenate, the undecylenate ester.[3][4][7]
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| Other names | Δ1-Testosterone; 1-Dehydrotestosterone; RU-18761; Androsta-1,4-dien-17β-ol-3-one |
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| Routes of administration | Intramuscular injection |
| Drug class | Androgen; Anabolic steroid |
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| Elimination half-life | Intramuscular: 14 days (asboldenone undecylenate)[2] |
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| ECHA InfoCard | 100.011.533  |
| Chemical and physical data | |
| Formula | C19H26O2 |
| Molar mass | 286.415 g·mol−1 |
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| Melting point | 165 °C (329 °F) |
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Like other AAS, boldenone is an agonist of the androgen receptor (AR).[7] 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.[8]
Boldenone, also known as Δ1-testosterone, 1-dehydrotestosterone, or androsta-1,4-dien-17β-ol-3-one, is a naturally occurring androstane steroid and a derivativeoftestosterone.[3][4][7] It is specifically testosterone with a double bond between the C1 and C2 positions.[3][4][7] A related compound is quinbolone, the 17-cyclopentenyl enol ether of boldenone.[3][4]
Boldenone occurs naturally in the scent glandofIlybius fenestratus, a species of aquatic beetle.[3]
Ciba reportedly patented boldenone in 1949.[7] It subsequently developed several experimental esters of the drug in the 1950s and 1960s.[7] One of these was boldenone undecylenate, which was introduced for clinical use under the brand name Parenabol and saw some use in the late 1960s and early 1970s.[7] However, it was discontinued before the end of the 1970s.[7] Subsequently, boldenone undecylenate was introduced by Squibb under the brand name Equipose for veterinary use, most commonly in horses.[7]
Boldenone is the generic name of the drug and its INNTooltip International Nonproprietary Name and BANTooltip British Approved Name.[3][4][5][6]
Boldenone is marketed as veterinary drug as boldenone undecylenate (a derivative of boldenone) under the following brand names: Boldebal H, Equipoise, and Sybolin.[6] It is marketed as a veterinary combination drug with methandriol under the brand name Drive.[6]
InUkraine, it is marketed for human consumption as the injectable steroid Boldenol.[9]
There are many known cases of doping in sports with boldenone undecylenate by professional athletes.