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Under these conditions different proteins can acquire different metals determined by their relative (with reference to the competing species within the intracellular milieu) metal-binding preferences, rather than absolute affinities

doi: 10.1016/j.yebeh.2023.109104 [PubMed] 36988597 Perez DL, Hoch DB, Cohen JN

This form of iron was found to be gentler on the stomach and better absorbed than other forms of iron in human studies conducted by Balchem