Anabolics 101 – Featuring Equipoise ( Boldenone Undecylenate)



  Anabolics 101 – Featuring Equipoise ( Boldenone Undecylenate)


Equipoise is the most commonly recognized trade name for boldenone undecylenate, an injectable veterinary steroid that exhibits strong anabolic and moderately androgenic properties. The undecylenate ester extends the activity of the drug greatly (the undecylenate ester is only one carbon atom longer than decanoate), so that injections need to be repeated only once every three or four weeks. The well-balanced anabolic and androgenic properties of this drug are greatly appreciated by athletes, who generally consider it to be a stronger, slightly more androgenic, alternative to Deca-Durabolin®. It is generally cheaper, and could replace Deca in most cycles without greatly changing the end result. Boldenone undecylenate is also commonly known as a drug capable of increasing red blood cell production, although there should be no confusion that this is an effect characteristic of nearly all anabolic-androgenic steroids (AAS).

How Supplied

Boldenone undecylenate is an injectable medication. It is usually prepared as 25 mg/mL, 50 mg/mL or 200 mg/mL of steroid dissolved in oil.


Effective Dosages

Although it stays active for a much longer time, boldenone undecylenate is injected at least weekly for physique- or performance-enhancing purposes. It is most commonly used at a dosage of 200-400 milligrams per week (men). The dosage schedule can be further divided to reduce the volume of each injection if necessary, perhaps administering the drug two to three times per week. One should also take caution to rotate injection sites regularly, so as to avoid irritation or infection.



Not a rapid mass builder, boldenone undecylenate instead provides a slow but steady gain of strength and quality muscle mass. The positive effects of this drug become most apparent when it is used for longer cycles, usually lasting eight weeks or more in duration. The muscle gained should also not be the smooth bulk associated with testosterone, but more defined and solid. Since water bloat is not contributing greatly to the diameter of the muscle, more of the visible size gained on a cycle of boldenone undecylenate should be retained after the drug has been discontinued.


When used for physique- or performance-enhancing purposes, women take much lower doses of boldenone undecylenate than men, typically 50-75 milligrams per week. Women should take caution with the slow-acting characteristics of this preparation, which make blood levels difficult to control and slow to decline should virilization symptoms become present.


Side Effects

Estrogenic: Boldenone is aromatized in the body to estradiol (estrogen). Elevated estrogen levels can cause side effects such as increased water retention, body fat gain and gynecomastia. Boldenone is considered a mildly estrogenic steroid. Aromatization studies suggest that its rate of conversion to estradiol is roughly half that of testosterone. The tendency to develop noticeable estrogenic side effects with boldenone should be slightly higher than nandrolone, but much lower than with testosterone. Estrogenic side effects are usually not pronounced unless this drug is taken in doses above 200-400 milligrams per week. An anti-estrogen such as clomiphene citrate or tamoxifen citrate might be used to help mitigate these side effects, should they become present. One may alternately use an aromatase inhibitor like Arimidex® (anastrozole), although it is considerably more expensive, and may negatively affect blood lipids.

Androgenic: Although classified as an anabolic steroid, androgenic side effects are still common with this substance, especially with higher doses. This may include bouts of oily skin, acne and body/facial hair growth. Anabolic-androgenic steroids may also aggravate male pattern hair loss. Women are also warned of the potential virilizing effects of anabolic-androgenic steroids. These may include a deepening of the voice, menstrual irregularities, changes in skin texture, facial hair growth and clitoral enlargement.

Liver Toxicity: Boldenone is not c-17 alpha alkylated, and not known to have hepatotoxic effects. Liver toxicity is unlikely.


Cardiovascular: Anabolic-androgenic steroids can have deleterious effects on serum cholesterol. This includes a tendency to reduce HDL (good) cholesterol values and increase LDL (bad) cholesterol values, which may shift the HDL to LDL balance in a direction that favors greater risk of arteriosclerosis. The relative impact of an anabolic-androgenic steroid on serum lipids is dependant on the dose, route of administration (oral versus injectable), type of steroid (aromatizable or non-aromatizable) and level of resistance to hepatic metabolism.

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Anabolic-androgenic steroids may also adversely affect blood pressure and triglycerides, reduce endothelial relaxation and support left ventricular hypertrophy— all potentially increasing the risk of cardiovascular disease and myocardial infarction. Boldenone is likely to have a less dramatic impact on cardiovascular risk factors than synthetic oral anabolic steroids. This is due in part to its openness to metabolism by the liver, which allows it to have less effect on the hepatic management of cholesterol. The aromatization of boldenone to estradiol may also help to mitigate the negative effects of androgens on serum lipids.


To help reduce cardiovascular strain, it is advised to maintain an active cardiovascular exercise program and minimize the intake of saturated fats, cholesterol and simple carbohydrates at all times during active AAS administration.


Testosterone Suppression: All anabolic-androgenic steroids, when taken in doses sufficient to promote muscle gain, are expected to suppress endogenous testosterone production. Without the intervention of testosterone-stimulating substances, testosterone levels should return to normal within one to four months of drug cessation. Note that prolonged hypogonadotrophic hypogonadism can develop secondary to steroid abuse, necessitating medical intervention.

The above side effects are not inclusive.



Boldenone undecylenate remains widely available as a veterinary drug product. It is produced mainly in the Americas, consistently at a dosage of 25 mg/mL or 50 mg/mL. Counterfeits do exist. Nearly all forms of the drug in higher concentrations (200 mg/mL) are of underground origin.



Biosynthesis of Estrogens, Gual C, Morato T, Hayano M, Gut M, and Dorfman R. Endocrinology 71 (1962):920-25.
502. Metabolism of boldenone in man: gas chromatographic/mass spectrometric identification of urinary excreted metabolites and determination of excretion rates. Schanzer, Donike. Bol Mass Spec. 21 (1992):3-16.


About the Author:

William Llewellyn is the author of the anabolic steroid reference guide, ANABOLICS 10th Edition . William adapted this steroid profile from his work at He is also credited with helping to develop ROIDTEST™ , an at-home steroid testing kit used to identify real and fake steroid products.

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