If you're tired all the time, you could be low in iron. Unfortunately, iron supplements are notoriously hard to absorb. Plus, they frequently cause constipation and irritation of the digestive tract. Flora Iron liquid formula is different. This innovative formula features liquid ferrous gluconate — a form of iron clinically proven to quickly and significantly raise iron levels. In fact, in a head-to-head test of four kinds of iron, liquid ferrous gluconate was the best absorbed and tolerated. It caused a 24% boost in levels of ferritin (stored iron) in just one month, with no digestive side effects.