L methionine (ajinomoto) can be useful when use wih DL-methionine as 50:50 ratio. you can see other article in below for more information:
1-Effect of L-methionine supplementation on plasma homocysteine and other free amino acids: a placebo controlled . double blind cross over study. European Journal of Clinical Nutrition. 59: 768- 775.
2-Comparative metabolism of L-methionine, DL-methionine and DL-2-hydroxy 4-methylthiobutanoic acid by broiler chicks.Br J Nutr. 1985 Nov;54(3):621-33.