Testicular injury to rats fed on soybean protein-based vitamin B12-deficient diet can be reduced by methionine supplementation.
Yamada K, Kawata T, Wada M, Mori K, Tamai H, Tanaka N, Tadokoro T, Tobimatsu T, Toraya T, Maekawa A. J Nutr Sci Vitaminol (Tokyo). 2007 Apr; 53(2):95-101.