Boldenone (Equipoise) is a steroid of the testosterone family (chemically it is a dianabol without the 17AA group, but with very different effects to d-bol), class 1 (strong binding to the androgenic receptor, AR).

Boldenone (commercially available as the undecylinate ester), patented in 1949 by Ciba under the name Parenabol, also known under the trade names Equipoise, Equifort, Equiboost, Ganabol, Equigan and Ultragan, is an anabolic steroid developed for veterinary use, mainly for the treatment of debilitated horses when an improvement in weight, coat or general physical condition is desired [1]. In the USA it is not indicated for use in humans and is only available through veterinary clinics. Boldenone was synthesized in an attempt to create a long-acting injectable methandrostenolone (Dianabol), but in reality boldenone looks almost nothing like D-bol. It has a very long half-life, and can appear in a test to detect steroids up to 1.5 years after use, due to the long undecylenate ester attached to the steroid. Traces of the drug can be easily detected for months after discontinued use. Many athletes (mainly fighters) have already fallen into doping through the use of boldenone, among them Stephan Bonnar, Josh Barnett, Phil Baroni and Antônio Silva (Bigfoot) [2]. Boldenone appears to have become popular with bodybuilders in the 1980s [3]. Dan Duchaine made an immediate comparison with nandrolone, speculating that it would act like nandrolone, but as a much stronger version of it. Boldenone does not actually act like nandrolone at all; nandrolone is actually a progestin and a steroid from the 19-nor family. Whereas boldenone is more closely related to testosterone. Duchaine [4] subsequently overturned his original statement on boldenone and said he was disappointing as a mass builder when compared to nandrolone, but a steroid but much better than for gains in strength and vascularity [5].

Boldenone undecylinate is a steroid with good anabolic power and with moderate androgenicity (anabolism / androgenicity: 100/50). Its effects can be compared to deca and testosterone, although it is not as anabolic as the last two [5]. In addition, because it is little androgenic, its side effects - even at high dosages - are milder than testosterone (acne, greasiness, hair loss, inhibition of the HPT axis, conversion to DHB, etc.), and its aromatization is low (about half of testosterone), and retention and gynecomastia (+1 on the Haluch scale) [6] are rare with this drug. Therefore, and because it is a long half-life drug (~ 12 days) [7], gains with boldenone are slow, but of quality. These characteristics, as well as the ability to increase the number of red blood cells (superior to other steroids), and also stimulate the appetite, make this drug very flexible, and it can be used in both bulk and cutting cycles . Because it is a long half-life drug, the most effective boldenone undecylinate cycles should be between 6 and 12 weeks, and the most effective dose is around 400-600 mg per week. Even with a long half-life, the effects of the drug can already be seen in the first 2 weeks, especially if used in high doses. Boldenone also has a low risk of virilization and an efficient and reasonably safe dose recommended for women is in the range of ~ 100-150 mg per week.

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