Vitamin B12 is made by microorganisms that are found in the soil and in water. Humans can’t produce B12 by themselves so rely on these natural sources for the levels they need to function optimally.

Over time, it could lead to nerve damage if left untreated. Long-term health risks. Many symptoms of vitamin B12 deficiencies ...

Vitamin B12 plays an essential role in the growth and development of our nervous system tissues and blood cells, Mark Loafman, M.D., a Chicago-based family physician tells Runner’s World.

Vitamin B12 deficiency, ... Supplements For mild deficiencies, over-the-counter Vitamin B12 supplements are often enough. ... doctors may prescribe B12 injections.

Vitamin B12 is made by microorganisms that are found in the soil and in water. Humans can’t produce B12 by themselves so rely on these natural sources for the levels they need to function optimally.