Bayer Proviron 25mg – 20 Tablets

Bayer Proviron is a pharmaceutical grade oral Mesterolone formulation manufactured by Bayer. One of the longest established pharmaceutical HCG and androgen preparations in clinical use, with a documented history spanning several decades of European pharmaceutical manufacturing and clinical research application. This formulation delivers 25mg per tablet in a 20 count pack, a compact supply format consistent with the concentration most commonly referenced in androgen and hormonal modulation research literature, with Bayer’s pharmaceutical manufacturing origin contributing a quality and purity benchmark that distinguishes it from research grade Mesterolone preparations.

Mesterolone is a synthetic androgen derived from dihydrotestosterone (DHT) with a pharmacological profile that makes it a uniquely positioned research compound within the oral androgen family. As a DHT derivative it does not aromatize under any circumstances producing no estrogenic conversion regardless of dose. Unlike most oral anabolic compounds, Mesterolone is not 17 alpha alkylated; a structural characteristic that eliminates the hepatotoxicity concerns associated with alkylated oral androgens and makes it one of the few orally bioavailable androgen compounds without documented significant hepatic stress marker elevation in research subjects. Its oral bioavailability is achieved through the 1-methyl modification rather than 17-alpha alkylation. A distinct chemical approach that contributes to its well characterized safety profile across decades of clinical literature.

Mesterolone’s most distinctive research characteristic is its documented high affinity for sex hormone binding globulin (SHBG), the plasma protein that binds and sequesters testosterone and other androgens, reducing free hormone availability. Mesterolone’s competitive SHBG binding displaces bound testosterone, increasing free testosterone availability in circulation without directly stimulating androgen receptors with the potency of testosterone or nandrolone based compounds. This SHBG displacement mechanism makes Mesterolone a frequently studied reference compound in research examining free androgen bioavailability modulation, androgen binding protein interaction, and the physiological distinction between total and free hormone concentrations. Critial to research dimension unique to Mesterolone within CSD’s oral androgen range.

Bayer Proviron is stocked by Canada Steroid Depot following the same rigorous third party lab verification process applied to every product in our range. Each batch is tested for concentration accuracy and purity before being made available, with COA documentation available on request. CSD’s sourcing standards apply uniformly across all manufacturers we carry, and Bayer’s Proviron meets those standards consistently. All orders ship discreetly across Canada in plain, unmarked packaging with no identifying information on the exterior.

Store in a cool, dry place away from direct light and heat. Intended for research purposes only.

Commonly researched alongside testosterone compounds and SERMs in comparative androgen bioavailability and HPG axis management studies. Browse CSD’s full PCT range for complete sourcing.