A deficiency in this essential nutrient can lead to an array of health problems, ranging from fatigue to permanent neurological changes.

B-12 shots, which can be self-administered, can quickly boost B-12 levels in someone who is deficient. They reduce the risk of some serious complications associated with B-12 deficiency including:

  • heart disease
  • neurocognitive disorders
  • vision loss
  • infertility

Research suggests that vitamin B-12 deficiency affects a greater number of older adults than those under the age of 65.


There is no upper limit for the intake of vitamin B-12 because the risk of toxicity or overdose is extremely low.