Biofilm inhibiting compositions enhancing weight gain in livestock

A method for the treatment or prophylaxis of a microbial infection or colonization in a human, the method comprising administering to the human—an effective amount of a composition comprising one or more Fe III complexes to reduce enteropathogen infection in the human, wherein the Fe III complex is a compound of Formula I:

• Fe(III)x(ligand)y Formula I,
• wherein
• x is an integer value of 1-2,
• y is an integer value of 1-3 and
• wherein the Fe III complexes comprise Fe III and one or more ligands,
• wherein each ligand is independently a conjugate base of an α-hydroxy acid selected from citric acid, tartaric acid, lactic acid, glycolic acid, quinic acid, glycolic acid, isoleucic acid, valic acid, malic acid, and mandelic acid;
• or each ligand is a conjugate base of an amino acid independently selected from the group consisting of glycine, alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine;
• and salts and/or hydrates thereof,
• and wherein at least one of the one or more Fe III complexes is in a concentrations ranging from 10 μM to 2 mM or 0.01 g/Kg of product to 20 g/Kg of product.