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.
Even if your test results are different from the normal value, you may not have a problem. To learn what the results mean for you, talk with your health care provider. Results are given in nanograms per milliliter (ng/mL). A normal range for vitamin B12 is 190 to 900 ng/mL.his test measures the levels of vitamin B12 and folate in your blood. Your body needs vitamin B12, also called cobalamin, and folate, also called folic acid, to function normally. Both nutrients play important roles in creating red blood cells and making DNA and RNA to help build cells.