What are the side effects of taking vitamin B12 supplements?

Vitamin B12 supplements are generally considered safe. However, some people may experience side effects, such as

Headache: This is the most common side effect of vitamin B12 supplements. It is usually mild and goes away on its own.
Nausea and vomiting: These side effects are less common than headache. They are more likely to occur if you take high doses of vitamin B12.
Diarrhea: This is also a less common side effect. It is more likely to occur if you take vitamin B12 supplements on an empty stomach.
Skin rash: This is a rare side effect of vitamin B12 supplements.
Allergic reaction: A very rare allergic reaction to vitamin B12 supplements can occur. Symptoms of an allergic reaction can include hives, swelling of the face, tongue, or throat, and difficulty breathing.

If you experience any side effects from taking vitamin B12 supplements, stop taking them and talk to your doctor.

Here are some tips to reduce the risk of side effects from taking vitamin B12 supplements:

Start with a low dose and gradually increase it as needed.
Take vitamin B12 supplements with food to reduce the risk of nausea and vomiting.
Drink plenty of fluids to help prevent diarrhea.
If you have a history of allergic reactions, talk to your doctor before taking vitamin B12 supplements.

It is important to note that the side effects of taking vitamin B12 supplements are usually mild and go away on their own. However, if you experience any serious side effects, stop taking the supplements and talk to your doctor immediately.

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