I began taking tums as a calcium supplement; to help flatten my mid section. I take 3 tums a day/ 900mg. after two weeks of taking the tums; it was time for for my menstrual cycle. I noticed that my flow had gone from absorbing one tampon every 2hrs.(give or take 15mins.) to every 3hrs. The next month my period continued to flow every 3 to 4hrs. for 3 days. I also take ortho novum birth control pills. (however, this change in my cycle took place when I began to take tums in addition to the bc pills. So tums may be of help to you. I still take them... Faith, for a light menstrual cycle is helpful too.