Will this iron upset my stomach?

It’s gentle enough for daily use. This formula features a fully-chelated form of iron, called Ferrochel®, that works by binding the mineral to glycine, an amino acid, making it less reactive and easier for you to digest without causing gastric upset. And it delivers up to 3X better absorption. Many common multivitamins use less expensive, non-chelated iron that’s hard to digest and poorly absorbed. For enhanced bioavailability and results, take our multivitamin with food.