I have been taking vitafem by Zita West. Supposed to be one of the best formulas for pre-conception. However i've had to stop taking them due to really really bad constipation (TMI) They contain about 15mg of iron, which i seem to be super sensitive too.. But noticed that most other makes contain iron too.... Not sure what to do ! I think i could take some that have a smaller amount of iron in them.... Anyone else have this problem ?. What do you all take ?.