Ancillary · AlphaStack™ Compound Database

Mesterolone

Also known as: Proviron · Mesterolone · Vistimon
WADA BannedAncillary

Side Effects & Risks

Performance Use

Proviron is used in performance settings for three specific purposes. First, it increases free testosterone by displacing it from SHBG, effectively amplifying the effect of whatever testosterone is already in the protocol without adding more. Second, it provides mild estrogen control, allowing some reduction in aromatase inhibitor dose. Third, it a...

Stacking & Combinations

Proviron appears in almost any stack as a supportive addition. It pairs naturally with testosterone-based protocols where increasing free testosterone and managing SHBG is beneficial. In contest prep it is sometimes used alongside Masteron for combined hardening and estrogen management. It is commonly added to cycles that include Nandrolone to coun...

Real-World Risk

The primary risk with Proviron is androgenic alopecia acceleration. Its high androgenic rating relative to its anabolic rating means hair loss in genetically susceptible men is pronounced. The SHBG displacement effect that makes it useful also means that increasing free testosterone increases the an...

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