B12 Supplement Side Effects

Here are the key points about potential side effects of vitamin B12 supplements:

• Serious side effects of vitamin B12 injections may include allergic reactions with hives, difficulty breathing, swelling of the face, lips, tongue or throat. Seek emergency medical help for these symptoms.

• Other serious side effects that require medical attention include heart problems like swelling and rapid weight gain, fluid buildup in the lungs, and low potassium levels.

• Common side effects that may occur but usually don't require medical attention include diarrhea and swelling.

• High doses of supplemental B3 (niacin) may lead to vomiting, high blood sugar, skin flushing, and liver damage.

• High doses of B6 can cause nerve damage, light sensitivity, and painful skin lesions.

• Consuming B vitamins in excess through supplements can turn urine bright yellow, which is not dangerous but simply the body getting rid of what it can't use.

• Serious side effects are unlikely if you follow the recommended dosage, which varies by age, sex, and health status.

While B12 supplements are generally safe, high doses of certain B vitamins can lead to side effects. Stick to the recommended dosage and consult your doctor if you have any concerns.