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甲基群勃龙（Metribolone），也被称为口服群勃龙，是一种极其强效的口服类固醇，具有显著的合成代谢和雄激素活性。Metribolone通过促进蛋白质合成和抑制蛋白质分解，帮助用户快速增加肌肉质量和力量。其独特的结构使其在增强肌肉和减少体脂方面表现出色，而不会引起水分潴留。尽管效果显著，用户需注意其肝毒性，建议在使用期间搭配护肝剂，并限制使用周期在4-6周内。

苯丙酸诺龙，DURABOLIN-NPP（GENENGIN）brand of Nandrolone phenylpropionate. Nandrolone phenylpropionate has been used mainly in the treatment of advanced breast cancer in women and as an adjunct therapy for the treatment of senile or postmenopausal osteoporosis in women.Historically, it has also had a variety of other uses.Because of its reduced androgenic effects, the drug has not generally been used in androgen replacement therapy for androgen deficiency in men and has instead been used for solely for anabolic indications.However, nandrolone esters have more recently been proposed for the treatment of androgen deficiency in men due to favorable properties including their high ratio of anabolic to androgenic effects and consequent much lower risk of prostate enlargement, prostate cancer, and scalp hair loss relative to testosterone.

Nandrolone phenylpropionate is used for physique- and performance-enhancing purposes by competitive athletes, bodybuilders, and powerlifters.Nandrolone esters have been said to be the most popular AAS used by bodybuilders and in sports.This is in part due to the high ratio of anabolic to androgenic effect of nandrolone and its weak propensity for androgenic and estrogenic side effects.