Proviron (Mesterolone) in Europe its used for an Androgen Deficiency In men and also use for problems fertility in men Which makes it very different from other anabolic steroids which as the adverse effect. It as anti-Oestrogen properties but isn’t an anti oestrogen. Proviron (Mesterolone) as well known libido effects because it Is a DHT derivative it stacks well with steroids like (Deca Durabolin)which as the opposite effect so It then gives you a good balance. remember DHT is a male sex hormone so this is always a good thing To increase your sex drive. The other thing about Proviron is it’s not that liver toxic as other oral steroids are You can even use it long term without the fear of damaging your liver. It works best when taking with other Steroids it binds itself to them making them more effective and adds support to the cycle.