Magnesium, NEVER! Could you cite the source, the studies? Is this the case with oral and non-oral estradiol? With bio-identical and non bio-identical?
Blood clots seem to be much less a concern when bio-identical estradiol is taken, especially non-orally. The risk significantly increases with other forms of estrogen such as birth control pills, ethinyl estradiol, Premarin and DES.
Androcur and Provera slightly raise risk of blood clots as well, it seems, according to reports and studies.