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Promagnon (Chloromethylandrostenediol)

Chemical Composition

4-Chloro-17A-Methyl-Andro-4-Ene-3, 17B-Diol
Manufacturer: 50-100 mg
Effective Dose (Men): 50-100 mg
Effective Dose (Women): Not Recommended
Half-Life: 8-10 Hours
Detection Time: Unknown
Anabolic/Androgenic Ratio: 55/50



Promagnon, a.k.a. Chloromethylandrostenediol, is a methylated derivative of the anabolic steroid testosterone that possesses three alterations. Firstly, Promagnon includes the attachment of a chloro group at carbon 4, which effectively inhibits aromatization thereby reducing androgenicity. Secondly, it substitutes the 3-keto with a 3-hydroxyl which reduces relative steroid activity, i.e. intentionally makes the steroid weaker. Thirdly, it has been c-17alpha alkylated to survive the 1st pass through the liver undiminished.

The resulting combination equates to a moderately potent supplement, which is also a fairly weak steroid with just enough potency to generate slight lean muscle mass. Though chemically more similar to methyltestosterone, Promagnon better correlated to slightly weaker DHT-derived compounds like Anavar and Winstrol.

Promagnon makes a great definition cycle additive, as it's designed to promote lean muscle, as well as improved muscular density, vascularity, and hardness.


Steroid Form

Promagnon wasn't FDA approved for sale as a prescription medication, and is no longer available. It was marketed in the US (by its actual name) as a sports nutrition supplement, and sold in tablets containing 25 mg of steroid each until it was voluntarily discontinued in late 2006. It is unknown, but unlikely that Promagnon is being produced by underground labs.


Indications/Purpose & Side Effects

For the Indications/Purpose & Side Effects of Promagnon see the Winstrol profile.


Additional Information

Promagnon stacks well with all forms of testosterones including cypionate, propionate, enanthate, and suspension. Promagnon also makes a great cycle ingredient with other traditionally potent anabolic steroids such as Equipoise, Deca-Durabolin, Primobolan, and Trenbolone.


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