The metabolites of Methenolone (Primobolan) result from the body breaking down the compound into various byproducts, which are later excreted through urine and feces. Since Methenolone is a Dihydrotestosterone (DHT) derivative, its metabolism follows similar pathways to other DHT-based anabolic steroids.
Primary Metabolites of Methenolone
Research and doping tests have identified multiple metabolites of Methenolone, including:
3α-Hydroxy-1-methylene-5α-androstan-17-one
A hydroxylated metabolite formed through Phase I metabolism in the liver.
Created by the reduction of the 3-keto group, making it a primary urinary metabolite.
3β-Hydroxy-1-methylene-5α-androstan-17-one
Another hydroxylated metabolite, differing from 3α-hydroxy in stereochemistry.
Helps detect Methenolone use in doping tests.
1-Methylene-5α-androstan-3,17-dione
A key oxidation metabolite found in urine samples.
Formed from the reduction of the C3 keto group in the steroid ring structure.
1-Methylene-5α-androstane-3,17β-diol
A secondary metabolite formed through the reduction of the 17-keto group.
Detected in urine and used in long-term metabolite testing.
1-Methylene-5α-androstane-17-one
A dehydrogenated metabolite that retains part of Methenolone's structure.
Commonly identified in anti-doping tests.
Detection & Metabolism of Methenolone in the Body
Methenolone undergoes hepatic metabolism (Phase I & Phase II reactions) in the liver.
It does not aromatize to estrogen, so there are no estrogenic metabolites.
It is excreted primarily via urine, with a detection window of up to 4-6 weeks in standard tests and several months in advanced long-term metabolite (LTM) detection.
Conclusion
Methenolone (Primobolan) is metabolized into several hydroxylated and oxidized metabolites, many of which can be detected in urine tests for doping control. These metabolites allow anti-doping agencies to track Methenolone use even weeks after discontinuation.
