Proviron (mesterolone) is an oral androgen preparation with little in the way of central inhibitory action — meaning it does not meaningfully suppress testicular function. Its main role, rather, is to make up for androgen shortfalls, which tend to creep in as men grow older.
By topping up declining endogenous androgen levels, Proviron is useful for conditions tied to low natural testosterone production. At the recommended therapeutic doses it does not impair spermatogenesis, which makes it a sensible option for men who want to safeguard fertility.
Another real advantage is tolerability. Unlike many oral androgens, Proviron sits well with the liver — a point that adds considerably to its medical value.
In sports pharmacology, it is often used for its ability to lift androgenic tone, increase libido and sharpen muscle hardness, all without the oestrogenic drawbacks — since it does not aromatise.








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