@jc76 said, "My EP also suggest magnesium OTC."

Hey, that's new to me, but Google agrees:

"Yes, magnesium can influence blood clotting, generally acting to reduce excessive clotting by relaxing blood vessels, preventing platelet stickiness, and balancing calcium's role in coagulation, effectively working as a mild natural anti-coagulant or anti-thrombotic agent, though it's not a potent blood thinner like medication"

Often many other good reasons for supplementing with a little Mg, add this to the list!