Before revision: Fish provides vitamin B12 in a macrobiotic diet, as bioavailable B12 analogues have not been established in any natural plant food, including sea vegetables, soya, fermented products, and algae.USDA National Nutrient Database for Standard Reference, Release 20: Vitamin B-12 (μg) Content of Selected Foods per Common Measure, sorted by nutrient content .
After revision: Fish provides vitamin B12 .