Active Life: 2.5 days
Detection Time: 11-12 months
Chemical structure: (17β)-3-Oxoestr-4-en-17-yl 3-phenylpropanoate
Nandrolone Phenylpropionate is a popular steroid which is structurally similar to testosterone, minus a carbon atom at the 19th position. This creates a steroid that exhibits less androgenic properties compared to that of Testosterone, resulting in the conversion to a weaker metabolite- dihydronandrolone, not DHT. Androgenic related side effects are still possible, but are likely to be of a less occurrence compared to that of the likes of testosterone. What is of a concern however is nandrolone phenylpropionate activity of a progestin, as being shown to have some affinity to the progesterone receptor. This can lead to progestin like side effects, which are actually similar to that of estrogen related side effects. This can be an issue among bodybuilders as the side effects can be easily be mistaken as estrogen related side effects and thus many try the usual anti-estrogens for treatment, to little effect. Progesterone does need estrogen to activate it however, so the inclusion of a competitive aromatase inhibitor, such as arimidex, will aid to keep estrogen levels low to avoid activation of the progesterone. This method is more of a prevention method however, as it will do little for already progesterone induced gynecomastia.
In terms of how Nandrolone Phenylpropionate functions, it’s just the same as Nandrolone Decanoate. Each one is made from the same hormone as the other. However, with NPP (Nandrolone Phenylpropionate), the half-life is shorter and the burst of Nandrolone is bigger, post-injection.