A coated proteinaceous material can be produced by contacting the proteinaceous material with de-oiled phospholipids or mixtures thereof containing less than 20% triglycerides. The coating has between 0.1 and 1.5% by weight of the total proteinaceous material, of de-oiled lecithin. The proteinaceous material is hydrophobic, especially amino acids having a hydrophobicity of higher than 1.0 kJ/mol. In particular, the amino acids are leucine, isoleucine, valine, phenylalanine, tryptophan and/or methionine. The coated amino acids can be incorporated into food products and medicaments.