Prevalence of vitamin B12 deficient Korean centenarians on the traditional semi-vegetarian was not higher compared with those from Western nations with animal-oriented foods. Screening of vitamin B12 contents has revealed that some traditional soybean-fermented foods, such as Doenjang and Chunggukjang, also Gochujang, Ganjang (soy sauce), cabbage Kimchi, and seaweeds (laver , sea lettuce, sea tangle, sea mustard ) contain considerable amounts of vitamin B12. Soybeans (steamed) and tofu do not contain B12. 

Laver, dried, seasoned & toasted - 55 -71 mcg in 100 g dry weight

Sea lettuce, raw  -  85 mcg in 100 g dry weight