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.
A. Vitamin B12 can be received in your diet through eating meats, eggs, milk and fish. The daily recommended daily requirement is set at 2.6 mcg. People that have a B12 deficiency may feel week, shaky, and experience mood disturbances. It is best to discuss your plan to take B12 as supplement with your doctor.nly about 10mcg. of a 500 mcg. dose taken orally is absorbed by the body.The next best form of B12 may be taken through pills that are dissolved under the tongue. If you decide on oral B12 supplementation, I recommend a dose of 1000 mcg. taken in sublingual form once per day.