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Nolvadex binds to estrogen receptors. In some tissues, the receptor is unactivated by the Nolvadex (tamoxifen) and so the Nolvadex, at moments when binding the receptor, blocks estrogen from acting.
In other tissues, Nolvadex actually activates the estrogen receptor and so behaves estrogenically.
This is unfortunately the case in the skin, which is why Nolvadex increases acne.
Its action in blocking the effect of estrogen in the hypothalamus can and usually does result in increased LH production, which stimulates greater testosterone production.
Unfortunately, along with greater T product comes higher estrogen production, as there is more T available for the body to convert to estrogen.
To control estrogen levels, an aromatase inhibitor (AI; also called anti-aromatase) is needed.
While dosages should be checked with blood testing, a reasonable starting point is about 0.36 mg letrozole per day, or about 0.72 mg every other day. This is an amount corresponding to taking a total of 2.5 mg per week.