ATD bonds to the Estrogen keeping it from bonding with the receptors, where Nolva works at the receptors. The standard dosage is 75mg/day split into three equal doses. Doses up to 100mg are sometimes necc. to get a good response. You have to apy attention to dosage, as I don't believe that some of the products (AI's) are ONLY ATD but have other products mixed into them. Therefore a 25mg caplet is not necc. 25mg of ATD. There seems to be a possibility of solidifying gains on an AAS or PH cycle when starting ATD during the last portion of the cycle, but starting too early would seem to hinder gains and actually make for a less effective PCT.
GG