Just posted this in another thread:
Letrozole (Letro)-
Letro lowers estrogen production in the body by blocking the aromatase enzyme, the enzyme responsible for estrogen synthesization. Letro has a very high rate of estrogen suppression in the area of 90%+, so care should be given to dosing as over suppression could lead to side effects associated with low estrogen levels, like achy joints, low energy levels etc. This can be an issue with all AIs but Letro is very good at its job and that leads to helping prevent bloating and gyno which may be associated with the use of AAS.[6] Letro has a fairly long active life so dosing of every other day, to even 1-2 times a week is optimal at doses of 0.25mg - 1.3mg.
Anastrozole (aka LiquiDex/Dex)-
Dex lowers estrogen production in the body by blocking the aromatase enzyme, the enzyme responsible for estrogen synthesization. Dosing of 0.5 mg to 1 mg a day should reduce serum estradiol about 50% in men,[5] which leads to helping prevent bloating and gyno which may be associated with the use of AAS. Active life is fairly short so daily to eod dosing is optimal.
Exemestane (Stane/Aromasin )-
Exemestane lowers estrogen production in the body by blocking the aromatase enzyme, the enzyme responsible for estrogen synthesization. Exemestane has about an 85% rate of estrogen suppression and does this by selectively inhibiting aromatase activity in a time-dependent and irreversible way. That helps prevent bloating and gyno which may be associated with the use of steroids. Stane has a fairly short active life so daily to every other day dosing is optimal.
Exemestane is 12.5 - 25mg ed or eod per above.