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Durobolic - Nandrolone Phenylpropionate Side Effects

Estrogenic effects are not a major concern with use of nandrolone phenylpropionate. However it can cause progesterone-like effects in some users. Commonly reported side effects associated with nandrolone are such things as acne/oily skin, insomnia, diarrhea, and nausea. These of course are coupled with the common side effects most often associated with anabolic steroids including testicular atrophy, gynecomastia (including lactation in some cases), and sexual dysfunction.

Nandrolone Phenylpropionate, also known as “NPP” is very similar to the very popular steroid Decanoate which is Nandrolone with a longer ester. Nandrolone Phenylpropionate is, therefore, a shorter acting Decanoate for all practical intents and purposes. Anecdotally, it seems to produce less water retention than its longer acting cousin, and this would be very consistent with injectable testosterones, where we find that shorter esters provide much less water retention.

It’s a progestin, like any Nandrolone derivative, and is made by removing the carbon atom at the 19th position of the Steran Nucleus of testosterone. However, although it’s a progestin, Nandrolone (regardless of ester) doesn’t produce much of what we could properly call estrogenic side effects. Any side effects from Nandrolone Phenylpropionate would therefore more properly be termed progestenic in nature- as it only converts to estrogen at roughly 20% the rate of testosterone.

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