Hi Everyone....Thank you for this post....I started taking a prenatal vitamin in December and had an abnormal period and abnormal bleeding .....which is really out of the ordinary for me....my cycle is usually runs like clockwork....I could not figure out what was going on and it stressed me out...I stopped taking the vitamins and the bleeding stopped....last month I started taking just the folic acid asand we are t2c and I started spotting again...so I'm my opinion it is the Folic acid that we are definitely allergic to....no more folic acid for me