8. Decrease in Muscle Strength

When feelings of muscle tiredness do not fade over a few days, a B12 vitamin deficiency could be the culprit. B12 provides oxygen to blood cells that carry it to the muscles. When muscles don't receive the required amount of oxygen, they become lethargic and sometimes even sore. If you experience extended sluggishness and uncharacteristic weakness, ask your doctor if a deficiency in B12 is to blame.

signs of b12 deficiency
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