Those obgyns that I know personally don't have a problem with the ingredients (one told me that by the time it is filtered through mom and the placenta, it's a very small amount that would reach baby anyway).
OT - I had an acquaintance on FB about 2 years ago selling Thrive. She didn't do it for very long but I remember her having a very prominent FB presence to promote it and wondering if she was provided a script to go by to attract customers, because her posts about it weren't in her usual vernacular.
I have to admit I'm now more intrigued by it than ever and half tempted to try it myself to see if it fulfills its claims.