According to a study (13), the benefits of B12 shots may be due to increased functionality of reproductive organs and reduced oxidative damage to sperm

Other causes of hand numbness include: Carpal tunnel syndrome (causes pressure on the nerves in the wrist and often occurs with overuse of the hands and wrists) A herniated disc that puts stress on the spinal nerves Nerve pressure caused by tumors, infections, or enlarged blood vessels Shingles Herpes infection Certain medications Vitamin B12 deficiency Abnormal levels of calcium, potassium, or sodium Excessive alcohol use Vasculitis (inflammation of the blood vessels) Lyme disease (a vector-borne disease that causes a small red bump at the site of an insect bite) Stiffening of the arteries, causing a lack of blood flow to the area Poor circulation due to diabetes Stroke Migraine headaches Underactive thyroid Raynauds syndrome (a condition that leads to artery spasms, reducing blood flow to the hands) Ganglion cyst (a noncancerous tumor that grows along the joints or tendons in the wrist

People with vitamin B12 deficiency show different recovery times, ranging from days to months before feeling fully well
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This hormone affects parts of the brain that control hunger
Do B12 injections help with weight loss