If you’re tired all the time, you could be low in iron — especially if you’re pregnant. Your body needs iron to form the red blood cells that deliver oxygen throughout your body. Unfortunately, iron supplements are notoriously hard to absorb. Plus, they frequently cause constipation and irritation of the digestive tract. Iron+ features a superior form of iron: ferrous gluconate. This iron is clinically proven to be better absorbed than other forms of the mineral.