It was Christmas week 1990 in Oakland. Steven Bloom was wandering through The Lot, that timeless gathering of hippies that springs up in the parking lot before every Grateful Dead concert, when a Deadhead handed him a yellow flyer.
Because of the general safety of the vitamin, upper limits for normal intake do not exist. If your blood values for the vitamin fall below a range of 170 to 250 picograms per milliliter, you may develop a B12 deficiency.
Vitamin B12, also known as methylcobalamin or cyanocobalamin, is an indispensable nutrient commonly found in a variety of non-plant based foods, such as fish, shellfish, meat, eggs, and dairy products.Because animal products provide optimum food sources for vitamin B12, vegans have the greatest risk for deficiency.Vegetarians who eat eggs and milk products are also at risk because, on average, they consume less than half of the adult Recommended Dietary Allowance (RDA) of vitamin B12.race amounts of vitamin B12 can be found within tempeh, seaweeds and organic plants in specific geographic regions. ** But unless and until these foods are shown consistently to correct vitamin B12 deficiency, vegans should not rely on them as a vitamin B12 source.