The present invention provides compounds of Formula I and related compositions and methods. Formula (I). R1 and R2each refer to a branched or unbranched carbon chain of from 1 to 20 carbons having at least one basic function； R1 and R2 are the same or different； X1 and X2 are independently selected from H and -CO-Z, where Z is a peptide moiety incorporating from 1 to 5 amino acids, or a pharmaceutically acceptable salt thereof； X1 and X2 are the same or different； M is a divalent metal cation selected from magnesium (Mg2 +), calcium (Ca2+), and zinc (Zn2+)； A and B are each a molecule having at least one acidic function, either A or B, but not both, may be absent, and when both A and B are present, A and B may be the same or different. In a particular embodiment, at least one of "A" and "B" or both are fatty acids. A representative example of the application is the compound Magnesium Lysinate bis docosapentaenoic acid shown hereafter, Formula； The complexes of the application are intended for pharmaceutical compositions or as food additive, notably to treat conditions responsive to treatment with polyunsaturated fatty acids.
