One of the most common warning signs is unusual tiredness.
Vitamin B12 deficiency can interfere with normal red blood cell production. When the body cannot transport oxygen as efficiently as it should, you may experience:
Persistent fatigue
Weakness
Reduced stamina
Feeling unusually exhausted after normal activities
Fatigue has many possible causes, so it should not automatically be blamed on B12 deficiency. A blood test may be necessary to determine the cause.
2. Numbness or Tingling in the Hands and Feet
Pins and needles, numbness, or unusual sensations in the hands and feet can be an important neurological warning sign.
Vitamin B12 is necessary for maintaining healthy nerves. Deficiency can eventually affect the peripheral nervous system and produce tingling or numbness.
New, persistent, or worsening numbness should be evaluated rather than treated with supplements without knowing the cause.
3. Problems With Balance or Walking
