What are the Side Effects of Taking Too Much B12?

Are you taking too much vitamin B12? It’s essential for good health, but too much can lead to some serious side effects. You need to understand how B12 affects your body and the risks of taking high doses. Learn what the signs are and how to avoid them.

This article will help you get informed about vitamin B12.


Vitamin B12 is an essential nutrient responsible for many bodily functions, including the formation of red blood cells and the proper functioning of the nervous system. However, taking too much B12 supplements can lead to some unwanted side effects.

Common side effects of high B12 intake include acne breakouts, rash, and rosacea. In addition, large doses of B12 may cause diarrhea, nausea, and stomach cramps. High B12 levels can also cause a decrease in appetite, leading to unintended weight loss.

Despite the potential side effects, it is important to consume enough B12 to maintain good health. The recommended daily intake of vitamin B12 for adults is 2.4 micrograms per day. If you are experiencing symptoms of B12 deficiency or have a condition that impairs nutrient absorption, talk to your doctor about supplementing your B12 intake. Pro tip: Always follow the recommended dosage instructions provided with B12 supplements to avoid adverse side effects.

Can you Take too Much B12

Vitamin B12 is a water-soluble vitamin that plays a crucial role in brain function, DNA synthesis, and the production of red blood cells. While B12 supplements can benefit those who are deficient in the vitamin, taking too much B12 can lead to a range of side effects.

Potential Side Effects
Nausea and vomiting
Loss of appetite
Nerve damage
High blood pressure

While it’s rare to consume too much B12 from food sources, taking high doses of B12 supplements can lead to adverse effects. It’s essential to follow the recommended dosage guidelines and consult your healthcare provider before taking vitamin B12 supplements. Pro tip: A blood test can determine if you have a B12 deficiency, and your doctor can help you determine the appropriate dosage for supplementation.

How Much Vitamin B12 is Too Much?

Taking too much vitamin B12 can have side effects, although it is generally considered safe in most circumstances. The recommended daily intake for vitamin B12 is 2.4 micrograms for adults, and it is essential for the proper functioning of the brain, nerves, and blood cells.

However, in some cases, excessive intake of vitamin B12 can lead to side effects such as headaches, dizziness, anxiety, and nausea. In rare cases, it can cause skin rash or acne breakout. It is essential to be mindful of the recommended dosage when taking B12 supplements, as some people may have allergic reactions or an upset stomach when taking too much.

If you suspect that you are experiencing side effects due to excessive B12 intake, consult with your doctor or healthcare provider immediately to avoid any further complications. Pro tip: Always consult with a qualified healthcare provider before taking supplements to ensure that you are not at risk of overdosing or developing undesirable side effects.

Potential Side Effects of Taking Too Much B12

Taking too much B12 can cause potential side effects that can range from mild to severe, depending on the level of toxicity. The recommended daily intake of B12 for healthy adults is 2.4 mcg per day, and exceeding this amount can lead to the following side effects:

1. Skin rash or acne, itching or redness
2. Headache, nausea, or vomiting
3. Dizziness, weakness, or fatigue
4. Nerve damage or numbness and tingling in the limbs
5. Blood clots and other cardiovascular problems if consumed in extreme excess

It is important to note that the risk factor of taking too much B12 is quite low, as excess B12 is typically excreted by the body. However, it is still recommended to consult with a healthcare professional before taking any supplements to avoid potential adverse reactions. Pro tip: Always follow a recommended dosage and consult a doctor if considering supplement usage.

Risks of Taking Too Much B12

While vitamin B12 is essential for our body, it is important to know that taking too much B12 supplements can cause a range of side effects.

– Skin rash
– Acne outbreak
– Headache
– Nausea
– Vomiting
– Diarrhea
– Joint pain
– Changes in body temperature

However, these side effects are rare and typically only seen with extremely high doses of B12. Most people can safely consume high doses of B12 without experiencing any negative effects.

Pro Tip: It is always best to consult a healthcare professional before taking any vitamin supplements to determine the appropriate dose tailored to your individual needs.

Long-Term Effects of Taking Too Much B12

Taking too much B12 can lead to long-term side effects that can negatively impact your health. While vitamin B12 is a necessary nutrient for proper body function, excessive intake can be harmful.

Some of the side effects of taking too much B12 include:

1. Skin rash
2. Acne
3. Rosacea
4. Numbness or tingling in the arms and legs
5. Depression and anxiety
6. Sleep disturbances
7. Digestive issues such as nausea, vomiting, and diarrhea

It is important to ensure that you are not overloading your body with beyond 2000 mcg of B12 daily. If you suspect that you have taken too much B12, seek immediate medical attention.

Pro tip: Always consult your doctor for the correct dosage of B12 supplements.

How to Avoid Taking Too Much B12

Taking too much B12 can lead to various short-term and long-term side effects that affect your health in various ways. These side effects include diarrhea, skin rashes, itching, anxiety, and joint pain. High doses of B12 can also interact with certain prescription medications, potentially making them less effective.

Therefore, whether you’re taking B12 supplements, injections, or consuming foods fortified with the vitamin, it’s crucial to follow the recommended daily dosage.

Here are a few ways to avoid taking too much B12:

1.Talk to your healthcare provider before starting B12 supplements and follow their dosage recommendations.
2.Avoid taking B12 supplements with other medications without consulting your healthcare provider.
3.Maintain a balanced diet with nutrient-rich foods like fish, milk, and eggs to meet your B12 RDA.

Remember, while B12 is an essential nutrient for the body, taking too much can cause more harm than good. Always prioritize balanced nutrition and consult a healthcare professional for guidance.


In conclusion, taking too much B12 can lead to some side effects. While it is rare for someone to experience adverse effects, it’s essential to know the symptoms because high doses of B12 can be dangerous. The tolerable upper intake level (UL) for vitamin B12 is 2,000 mcg per day for adults.

Skin rashesItchy and red bumps
ItchinessUncontrollable itchiness on the skin
DiarrheaLoose and watery stools
BreathlessnessShortness of breath
SwellingSwelling in the extremities

If someone suspects they are experiencing any side effects of B12 overdose, they should immediately discontinue consuming the supplement and seek medical attention. Overdosing on B12 does not cause any severe long-term harm to your body, but it could lead to other health concerns. Therefore, it’s crucial to follow the right instructions on the dosage and consult with a healthcare professional before taking any B12 supplement.