do you NEED to drink them? they are basically a chemical sh!t storm loaded with sugar and other crap.
I guess that's the reason why hospitals feed Ensure and Boost to patients who are unable to eat, through tubes, and recommend to supplement their meals with it once they are safely able to return home? It saved some of my family members lives while being treated for Khron's and cancers, I think it's safe to give a pregnant woman. That, and the fact that an ACTUAL doctor recommended it voids your opinion.
OP, I was recommended Similac Mom since I needed to supplement my iron and calcium intake, being lactose intolerant and anemic pre-pregnancy. It has worked fine, but if it hadn't I'd be taking Ensure instead, and the recommendation was only 1 a day, every other day, on top of my PN vitamins.