3Marchetti M, Ashmead H D, Tossani N, et al. Comparison of the rates of b vitamin degradation when mixed with metal sulphates or metal amino acid chelates. Journal of food composition and analysis, 2000(13): 875-884.
4Nelson E W. The amino acid as chemical temptation or trout and salmon. Feed Management, 1991, 42(3): 6-10.