1. Unexplained fatigue
If you feel exhausted, even when you slept well, and do not feel energetic, it could be possible that your body misses this vitamin. It is caused by the lack of red blood cell production, which is one of the functions of B12. In that case the oxygen transport to the organs is obstructed and causes fatigue.
A shortage of B12 can result in dizziness and vertigo, as well as a feeling of unstability when getting up to fast from a seating position and when walking upwards or downwards.
Low B12 levels can also lead to often forgetting things. You could think it might be early dementia, but chronic and unusual forgetfulness is a common symptom of this deficiency. By taking supplements you can raise the B12 levels and give your memory a boost.
A shortage of B12 often causes tingling sensations throughout the body because the vitamin influences the production of red blood cells and therefore the oxygen levels. Numbness or a feeling of electrical pulses can be a result of nerve damage.
5. Muscle weakness
When muscles do not receive a sufficient amount of oxygen from the red blood cells, they weaken and become slow.