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Manufacturer: Genesis

Nandrolone phenylpropionate stands as an injectable variant of the anabolic steroid nandrolone, akin to Deca-Durabolin, which employs the slower-acting nandrolone decanoate. The core discrepancy between them lies in the pace of nandrolone release into the bloodstream. While nandrolone decanoate persists in the system for about 3 weeks post-injection, nandrolone phenylpropionate showcases activity for roughly a week. In clinical practice, Deca-Durabolin might be administered bi-weekly or tri-weekly, contrasting with Durabolin's usual dosage schedule of several days to weekly. Nonetheless, both offer comparable advantages. Athletes and bodybuilders appreciate Deca-Durabolin for fostering strength and lean muscle mass sans notable estrogenic or androgenic side effects.

Structural Attributes:

Nandrolone decanoate, a modified form of nandrolone, integrates a propionic phenyl ester onto the 17-beta hydroxyl group. Such esterified steroids exhibit decreased polarity compared to free ones, leading to slower absorption post-injection. Upon entering the bloodstream, the ester is cleaved off, liberating active nandrolone. This design prolongs therapeutic effects post-administration, necessitating less frequent injections compared to free steroid forms. Nandrolone phenylpropionate elicits a rapid spike in nandrolone release within 24-48 hours of deep intramuscular injection, followed by a decline to baseline levels within a week.

Side Effects (Estrogenic):

Nandrolone showcases a modest propensity for estrogen conversion, approximately 20% of that seen with testosterone. Liver-driven conversion of nandrolone to estradiol is limited, diminishing estrogen-related concerns compared to testosterone. Elevated estrogen levels might still manifest with higher dosages, prompting side effects like water retention, body fat gain, and gynecomastia. Anti-estrogens such as clomiphene citrate or tamoxifen citrate might be necessary to counter estrogenic effects if they arise. Alternatively, aromatase inhibitors like Arimidex can efficiently manage estrogen by inhibiting its synthesis, albeit at higher costs and potential negative impacts on blood lipids.

Note on Progestin Activity:

Nandrolone exerts some progestin activity, akin to progesterone, which may induce similar side effects as estrogen, including testosterone production inhibition and heightened fat storage.

Side Effects (Androgenic):

Although categorized as an anabolic steroid, androgenic side effects are plausible, particularly with elevated doses. These might include oily skin, acne, and hair growth on the body and face. Women should be wary of virilizing effects, such as voice deepening, menstrual irregularities, and clitoral enlargement. Nandrolone's relatively low androgenic activity compared to its tissue-building prowess indicates a higher threshold for pronounced androgenic effects vis-a-vis more androgenic agents like testosterone.


Nandrolone phenylpropionate offers a potent anabolic tool for physique enhancement, albeit not devoid of potential side effects. Understanding its structural and physiological characteristics is vital for informed use and minimizing risks.

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