Proviron(Mesterolone) is not an AI. I got what you wanted to say, it can help reducing the effects of E2 due to its high androgenic effect, but it is not an AI after all. It does not work like AIs.
Indeed, inhibing e2 isn't the main effect of Proviron. It's an SHBG inhibitor, with AI secondary effects. Lowering e2 via proviron is a fact, like drostalonone which is an anabolic steroid and with AI secondary effect, It's called AI by misnomer.
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