Stuff: Your cart is empty.

Average Customer Review:

View all 3 reviews


Everything > Muscle Building > Prohormones > 1,4-Andro > Molecular Nutrition Boldione

Supplement Brand: Molecular Nutrition
Boldione Information

(Patent Pending)

Boldione (1,4-androstadiene-3,17-dione) is the lead innovation to arise out of the next generation of orally active prohormones. It is a direct precursor to the anabolic steroid boldenone, and displays a level of oral bioavailability far superior to any other compound, including the new 1-androstenes. If you are unfamiliar with boldenone, it is an anabolic steroid most often found in injectable form as a veterinary medication (boldenone undecylenate). It is chemically a derivative of testosterone, characterized as a strong anabolic and low to moderately androgenic agent. As its name indicates, Boldione is simply the dione form of boldenone, activated in the body by the same widely distributed 17beta-hydroxysteroid dehydrogenase enzyme that converts androstenedione to testosterone.

Boldione is truly the most advanced and potent anabolic prohormone ever developed, exhibiting several undeniable advantages over competing products:

The Most Orally Active Prohormone

Boldione is unquestionably the most orally active prohormone ever developed. As you probably know, poor oral bioavailability is one of the most fundamental problems with prohormones. The liver processes natural steroid hormones so efficiently, that when taken orally little will make its way all the way through to the blood stream in active from. All but a small percentage of the steroid will typically be found as an inactive 17-keto steroid. Here the 17 beta-hydroxyl group, vital to androgen binding, is removed and the compound rendered inactive. To solve this problem with pharmaceutical agents, chemists have synthetically altered most oral steroids with some form of 17-alpha alkylation (typically a methyl or ethyl addition), which virtually inhibits 17-ketosteroid reduction by occupying a carbon bond necessary for this reaction. But this type of alteration is also toxic to the liver, synthetic, and clearly not possible to use with natural prohormones.

The structure of Boldione however is intrinsically resistant to 17-ketosteroid deactivation during this first pass through the liver. The combination of its delta 1 and delta 4 double bond (1,4-Di Ene) shifts the hepatic metabolism (the 17-keto redox potential) of this compound far in favor of activation. This is made clear by studies showing Boldione to produce by far the most profound excretion of active 17beta-hydroxysteroids we have seen of any prohormone, as much as 50% of recovered urinary metabolites [1] . Surprisingly the 17beta-hydroxyl group survives hepatic metabolism to an enormous degree. Although this is not the near 100% recovery you would expect with a synthetic agent, it is amazingly superior (by far) to every other prohormone ever developed including the 1-androstenes [2] .

by far the most profound excretion of active 17beta-hydroxysteroids of any prohormone, as much as 50% of recovered urinary metabolites

Figure 1 compares the 17-beta hydroxysteroid recovery of 4-androstenedione, the new 1-androstenedione, and Boldione (1,4-androstadienedione). As you can see, the delta 1 bond alone increases active metabolite recovery considerably. However when we add the additional delta 4 bond, the recovery is far more dramatic.

Favorable Aromatization

Boldione converts to estrogen at roughly half the rate of androstenedione and testosterone [3] . This significantly reduces the level of estrogen buildup during use compared to that achieved with testosterone precursors, and similarly also lowers the chance of noticing strong estrogen related side effects such as increased body fat, gynecomastia and definition hiding water retention. It is no coincidence that the best bulking agents are estrogenic though, as this hormone does offer more than just side effects. Aside from the basic size increase we would attribute to fluid retention, estrogen also aids the muscle building process by enhancing glucose utilization for tissue growth and repair [4] [5] , increasing growth hormone secretion [6] and perhaps even by increasing androgen receptor concentrations [7] . It is clear today that estrogen serves a positive function in muscle growth, finally allowing us to explain a well known anecdotal fact: Aromatizable steroids are always the strongest muscle-builders, and preferred over non-aromatizable steroids when mass is desired. Boldione coverts to estrogen at a high enough rate to potentially support ethe effectiveness of boldione, yet is typically mild enough not to promote unwanted side effects. The long and fond relationship bodybuilders have had with boldenone is a clear testament to this fact.

estrogen also aids the muscle building process by enhancing glucose utilization for tissue growth and repair, increasing growth hormone secretion and perhaps even by increasing androgen receptor concentrations

Reduced Androgenic Activity

Boldenone is classified as an anabolic steroid, exhibiting much less androgenic activity than its analogue testosterone. This is because unlike testosterone, boldenone is a poor substrate for the 5-alpha reductase enzyme [8] . This is the enzyme responsible for converting testosterone to the more potent steroid dihydrotestosterone in many androgen responsive tissues such as the skin, scalp, prostate and central nervous system. Consequently the local potency of testosterone is increased significantly in these tissues, often allowing it to trigger unwanted side effects such as oily skin, acne, body/facial hair growth and male pattern hair loss (for those with a genetic predisposition). But boldenone tends to interact with the 5-beta reductase enzyme instead, which reduces this steroid into a very weak binder of the androgen receptor instead of potentiating its activity. Consequently boldenone is much milder in terms of androgenic side effects compared to testosterone, being much more similar to nandrolone in this regard.

A Naturally Occurring Hormone

In order for any prohormone to be classified as a nutritional supplement, the compound in question must be naturally occurring. This means that we must isolate a clear source for it in nature, without human synthesis. Thankfully 1,4-androstadienedione was shown unquestionably to be a natural androgen in cows. The first study to isolate this compound was conducted back in 1956, where scientists believed that it was most likely produced from progesterone in the animals gastrointestinal tract [9] . Later studies show the production of this hormone in cow ovarian tissues however [10] , suggesting another location and method of endogenous production. We can also look toward studies in the agricultural industry, where the natural occurrence of 1,4-dienones [11] have caused some difficulty and debate over the screening processes used for detecting the illegal use of boldenone in cattle. Many have suggested threshold limits to prevent false positives due to the low level of 1,4-diene androgens that may be present naturally in these animals.

How Supplied

100mg 1,4-androstadiene-3,17-dione per capsule, 60 capsules per bottle.


[1] Metabolism of 1-dehydroandrostanes in man. I. Metabolism of 17-beta-hydroxyandrosta-1,4-dien-3-one, 17-beta-cyclopent-1-enyloxyandrosta-1,4-dien-3-one (quinbolone) and androsta-1,4-dien-3-one (1). Galletti F and Gardi R. Steroids 18 (1971) 39-50.

[2] Metabolism of 1-dehydroandrostanes in man. III. Metabolism of 17-beta-hydroxy-5a-androst-1-en-3-one, 17-beta-(1-methoxy-cyclohexyloxy)-5-a-androst-1-en-3-one (mesabolone) and 5a-androst-1-en-3,17-dione. Galletti F and Gardi R. J Steroid Biochem 3 (1972) 933-6. [3] Biosynthesis of Estrogens, Gual C, Morato T, Hayano M, Gut M and Dorfman R. Endocrinology 71 (1962) 920-25

[4] Aromatization of androgens to estrogens mediates increased activity of glucose 6-phosphate dehydrogenase in rat levator ani muscle. Endocrinol 106(2):440-43 1980

[5] The pentose phosphate pathway in regenerating skeletal muscle. Biochem J 170: 17 1978

[6] Activation of the somatotropic axis by testosterone in adult males: Evidence for the role of aromatization. Weissberger and Ho. J Clin Endocrinol Metab 76 (1993) 1407-12.

[7] Modulation of the cytosolic androgen receptor in striated muscle by sex steroids. Rance, Max. Endocrinol 115 (1984) 862-6

[8] Metabolism of Beldenone 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

[9] Identification of C19 Steroids in Bovine Feces. Miller, W.R., C.W. Turner, D.K. Fukushima and I.I. Salamon: J. Biol. Chem. 1956 220: 221

[10] The in-vitro metabolism of progesterone-c14 to Delta-1,4-Androstadiene-3,17-dione by a cystic bovine ovary. Gawienowski A. M., Lee S.L. and Marion G.B.: Endocrinology 69 (1961) 388-90.

[11] C. J. M. Arts, R. Schilt, M. Schreurs and L.a. Van Ginkel, in Proceedings of the Euroresidue III Conference, Veldenhoven, 6-8 May 1996 ed. N. Haagsma and A. Ruiter, University of Utrecht, Utrecht, The Netherlands, 1996, p. 212


*These statements about Boldione have not been evaluated by the Food and Drug Administration. Boldione is not intended to diagnose, treat, cure, or prevent any disease.

We've discontinued Boldione and we no longer have it in stock.

Boldione Reviews

Write a Boldione review and share your thoughts with fellow athletes.
  1.  good stuff
    Well, i have been taken this product for 3 weeks now, and i´ve already seen some good results. I have gained 2 kilos bodyweight, and added more weight i every exercies. I have not noticed any side effects at all.
    Reviewer: Glen from Denmark on January 29, 2006

  1.  sucks cock
    i used it for a month and didn't see much or any results,just like any legal supplement it sucks
    Reviewer: damyou from texas on July 28, 2005

  1.  Boldione producing positive results.
    I have been taking Boldione for about a month now. During the first two weeks I noticed few results other than a markedly increased appetite. By week three I easily added 10-20 lbs to my regular sets. It seems that I am able to add a little weight here and there almost every trip to the gym. I weighed 200 lbs prior to use and now weigh 205. Do not sit on your duff if you take this supplement! It makes you very hungry and could make you fat if your workouts are less than ambitous. I will continue to use this supplement as long as I can put in an intense workout.
    Reviewer: Brennan from Bellingham, WA on March 22, 2005


Home  |  Contact Us  |  Return Policy  |  Shipping Cost  |  What Our Customers Are Saying
Bodybuilding Sites  |  Discontinued Brands  |  Terms of Use  |  Security and Privacy
© Copyright 2002-2006