3. You are feeling strange sensations throughout your body
Vitamin B12 helps to protect your nerves, including how they function. If you aren’t getting enough of the vitamin, your nerves could end up becoming damaged. As a result, you may start to experience odd sensations.
Some people who are vitamin B12 deficient have reported that they feel as if there is an electrical current running throughout their bodies, or that they have numbness or a pins and needles sensation.
Since the nerves are responsible for the sensations that you experience, if they become damaged as a result of a B12 deficiency, you could definitely start to experience odd sensations throughout your body.