If your reactions cluster around the same quadrant or follow a dose increase, the failure mode is concentrated exposure, not random bad luck
About six percent of Americans under the age of 60and 20 percent of those over 60have a B12 deficiency (1)
We need more evidence to know if the pills are as effective as the shots over time, though some research suggests they work, especially when it comes to sublingual supps
From synthesis to delivery, every step is engineered to meet the expectations of professionals who require accuracy, consistency, and reliability
B12 levels can become low as a result of inadequate nutrition, decreased absorption of this vitamin in the intestines, stomach problems, infections or cancer
Annals of Surgical Oncology 2011;18 Suppl 3:S1968 (author reply S199)