Hey guys, I was just wondering if any of you have noticed differences in your menstual cycle after taking a biotin vitamin?  My period is usually about 2-3 days and I don't usually get cramps or any side effect except for sore breasts but since I've started taking biotin pills I have no warning of when my period is going to come.  My chest doesn't get sore any more and this is now the second month that my period isn't starting on time.  The first time I chalked it up to stress going through a really hard breakup.  Does anyone have any insight?