Disclosed are methods and complexes for increasing magnesium uptake in mammals. Increasing magnesium uptake in mammals is accomplished by concurrently administering one or more magnesium salts with one or more quaternary amines and/or phosphatides and one or more di- or tri-carboxylic acids, in a one part dosage system or a multi-part dosage system. Increasing magnesium uptake in mammals may also be accomplished by concurrently administering one or more magnesium salts with an organic acid.
