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 deficiency of either B6 or B12 can cause anemia, so these vitamins may be taken to treat this condition, which leads to low energy. Adults ages 19 to 50 need 1.3 milligrams of vitamin B6 daily, while older women need 1.5 milligrams and senior men need 1.7 milligrams.aking too much vitamin B6 can cause nerve damage, but vitamin B12 is safe for most people.