Vitamin B12 Overdose: Symptoms, Risks & What to Do

Vitamin B12, or cobalamin, is commonly obtained from food sources such as beef, sea food and dairy. It can also be ingested in the form of a dietary supplement or injected as a B12 shot. When a person overdoses on B12, they may suffer some symptoms.

Swelling

• The patient may experience swelling and tenderness, particularly in the feet, ankles and leg calves. Swelling of the mouth, lips, tongue or face may also occur.

Blood Clots

• The patient may develop blood clots in the legs. Her or she may also suffer unexplained bleeding and bruising as well.

Hives

• The patient may develop a case of hives, which are characterized by an eruption of an itchy skin rash.

Chest Pain

• The patient my experience some tightness and pain in the chest as well as shortness of breath and difficulty breathing. An irregular heartbeat may also result.

Muscle Weakness

• The patient may develop muscle weakness or suffer from muscle cramps, tingling or numbness in the extremities may also be experienced.