Mesterolone, widely known by its pharmaceutical brand name Proviron, is a synthetic androgen derived from dihydrotestosterone (DHT) with a pharmacological profile that distinguishes it from most other oral androgenic compounds in research. F40 Biotech’s formulation delivers 20mg per tablet in a 50 count format, a lower unit dose than the Bayer Proviron 25mg 20 tablet pharmaceutical presentation in CSD’s range. Providing a higher tablet count at a reduced per dose concentration suited to research protocols requiring precise low dose titration or extended supply continuity at the lower end of the Mesterolone concentration spectrum.
The 20mg F40 Biotech and 25mg Bayer Proviron presentations serve distinct research purposes within CSD’s Mesterolone range. The Bayer pharmaceutical format carries the quality and purity benchmark of licensed pharmaceutical manufacturing with a 25mg unit dose consistent with the concentration most commonly referenced in clinical Mesterolone literature. The F40 Biotech 20mg format provides a lower unit dose with a substantially higher tablet count suited to dose response research examining Mesterolone’s SHBG binding and free androgen bioavailability modulation at sub 25mg concentration points, or extended protocols where the 50 tablet supply covers a longer research timeline than the 20 tablet Bayer format supports.
Mesterolone’s defining research characteristics remain consistent across both presentations: non aromatizing DHT derivative producing no estrogenic conversion regardless of dose, oral bioavailability achieved through 1-methyl modification rather than 17-alpha alkylation eliminating the hepatotoxicity concerns of most oral androgens, and documented high affinity SHBG competitive binding that displaces bound testosterone and increases free androgen availability in circulation. This SHBG displacement mechanism makes Mesterolone a uniquely positioned research compound within CSD’s PCT and androgen range. The only oral compound specifically studied for free testosterone bioavailability enhancement through binding protein competitive displacement rather than direct androgen receptor activation or aromatase inhibition.
F40 Biotech formulations are 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 stocks Mesterolone across two presentations: this F40 Biotech 20mg 50 tablet format and the Bayer Proviron 25mg 20 tablet pharmaceutical format. It gives researchers concentration, supply volume, and manufacturer flexibility within the same compound from a single verified Canadian supplier. 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.
