So many Iron supplements cause nausea, digestive upset, and constipation. If you are anemic or have low iron levels, this is the product for you. It is easy to take with no digestive upset or constipation. If you have 'iron resistant anemia', meaning you took your prescription iron regularly with no change in the blood tests, Hemagenics is the product you need. It contains co-factors that help your body uptake and utilize the iron. Available online and Amazon.