Not sure about obimin, but if like what previous commenter mentioned that it contains iron, basically you have to wait about 2hours apart for iron and calcium, reason being calcium will reduce/affect the absorption of iron, hence, the benefit of iron will be reduced or maybe cancelled out? My gynae advised 2hours apart. Some Google websites state 1hour is enough. My gynae suggests taking calcium in the day and iron by night will be easiest. Hope the info helps.