and Weakness
One of the most common symptoms of vitamin B12 deficiency is unusual tiredness. This is not just normal tiredness after a long day. It may feel like your body has no energy, even after rest.
You may feel weak, heavy, sleepy, or unable to do normal daily activities. This can happen because low B12 may reduce healthy red blood cell production, which can affect oxygen delivery.
Mayo Clinic lists fatigue and muscle weakness among symptoms that can happen with very low vitamin B12 levels.
2. Pale Skin or
