For readers already familiar with some of my writings, it will come as no surprise that the first thing we´ll need to do in examining Dynabolan (Nandrolone Undecanoate) is have a quick look at its structure. Firstly, we can see that this is a 19-nor steroid. In fact, this is just another type of Nandrolone, which means that it will share many, if not all of its traits with "Deca" (Nandrolone Decanoate, trade name: Deca-Durabolin). As we know, Nandrolone is similar to testosterone, with the exception of the alteration of the 19th carbon atom. And the "Undecanoate" part of this drug´s name (that´s the ester, or the thing that slows its release into your bloodstream) provides a slightly longer release time than Deca has. If I can suggest that everyone takes one thing away from this profile, it´s that this drug is more or less a slightly longer acting version of Deca, which means you need to employ it for a extended length of time to see results (12 week cycles are recommended when using this compound). Also, this long release time and the ubiquitous nature of Nandrolone´s metabolites make it unsuitable for drug-tested athletes.
Before we go into all of the wonderful characteristics of this drug, let´s discuss some of the less-than-wonderful aspects of it. Most side effects common with most AAS are also common with this drug: possible virilization (development of male sexual characteristics in women), gynocomastia, water retention, acne, hairloss, and possibly even sexual dysfunction... Being a Nandrolone, Dynabolan is also going to have the ability to stimulate the progesterone receptor 20% as well as progesterone does (1) (2). This stimulation of the progesterone receptor is primarily responsible for the suppressive effects that this drug will have on the body´s natural endocrine system. Progesterone (and synthetic progestins, like Nandrolone) can reduce luteinizing hormone production. This hormone is secreted from the pituitary and stimulates testicular testosterone production. Anabolic/Androgenic Steroids (AAS) can also suppress this hormone´s pituitary borne production by interfering with the Gonadatropin Releasing Hormone signal sent from the hypothalamus to the pituitary, which in turn also stimulates lutenizing hormone secretion. So it should be clear that this compound, through various mechanisms, will act to halt testosterone production in your body, as well as other important hormones. The now infamous "Minto" studies on Nandrolone have shown us that even a single 100mg injection of Nandrolone (although Undecanoate was not used, both a short as well as long ester Nandrolone product were used) will shut down endogenous (natural) testosterone production for a week, and will not return to baseline values until roughly 3 weeks later (3). Dynabolan will also aromatize (convert to estrogen) at a reasonably low rate, much lower than that of testosterone, for example. Given the estrogenic/progesteronic side-effects that this drug will have use of an anti-progesteronic drug (such as Bromocriptine at 2.5mgs/day) as well as perhaps some Letrozole (1mg/da