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5 Common Side Effects Of Too Much Vitamin B 12

Monday, February 22nd, 2010

vitamin b12

Vitamin B12 is derived from meat and dairy as well as poultry and is a necessary vitamin that can give people energy. Physicians will often give a Vitamin B12 shot to those who are anemic or those who are weakened due to illness or the flu to give them these necessary nutrients. However, too much of even a good thing can cause side effects that are not desirable. Those who take supplements of Vitamin B 12 should be aware of the side effects that can occur when too much of this component is in the system.

The 5 most common side effects of too much Vitamin B12 include:


Swelling can occur in the feet, hands and legs from too much Vitamin B12.  If you experience swelling when you are taking these supplements, you should consult with your doctor. There are many underlying medical conditions that can cause swelling in the body but in many cases it is due to too much Vitamin B 12. If the vitamin is found to be the culprit, then a reduction in the amount of the vitamin will be recommended to see if the swelling subsides.

Blood Clots

Blood clots are a serious side effect to having too much Vitamin B12.  Blood clots can lead to heart attack or stroke. It is important that any patient who has unexplained bleeding or bruising seek out a doctor regarding this condition. It is important for those who are taking a vitamin supplement such as B12 to take only the daily recommended dosage to avoid this potentially deadly side effect that can occur from too much of this vitamin.


There are various reasons why people break out in hives and in some cases, too much Vitamin B 12 can be the problem. Hives are noted as large welts that itch and can be found all over the body. Those who have hives and also suffer from a fever should see a doctor as this can be due to a toxic allergic reaction. Hives are very common for a number of other reasons, besides Vitamin B 12, however those who are taking this supplement should be aware that they can also be caused by taking too much of this vitamin. As an overdose of Vitamin B12 can lead to more serious health problems, noting the advent of hives can often be a first indicator that a patient is getting too much Vitamin B 12.

Chest Pain

b12 deficiency test

b12 deficiency test

Chest pain is characterized by a tightness in the chest as well as shortness of breath. Most people who experience chest pain will seek out a doctor as this can be indicative of a number of different conditions, including heart disease or a heart attack. An irregular heartbeat can be picked up by a physical examination and difficult breathing may also accompany chest pain. These are symptoms that someone cannot afford to ignore and should be brought to the attention of a qualified medical physician. In some cases, chest pain can be attributed to anxiety and stress. Those who are taking supplements of Vitamin B 12, or who eat foods that are concentrated in this Vitamin should be aware of this symptom. Chest pain should always be addressed by a doctor.

Muscle Weakness

Muscle cramps and tingling can also occur in those who have an overdose of Vitamin B 12. There can be a numb feeling in the extremities due to too much Vitamin B 12 as well. Muscle weakness should not be ignored and should also be addressed by a medical professional.

10 Important Side Effects of too Much Vitamin B12 That People Don’t Think About

Monday, February 15th, 2010

Vitamin B12 is an important vitamin that is found in food and is also taken through a shot, supplements and gel. Used to help in weight loss and other medical problems such as anemia in patients, this vitamin is an important part of our diets. Vitamin B12 helps to metabolize fats and proteins stored in the body, makes a special fatty coating that protects your nerves, helps you to produce and grow new cells, restores mental clarity and reduces the risk of several cardiovascular diseases among many other necessary and useful things. However, while it has many benefits, there are also some side effects that can make you ill if it is taken in large doses. Many of these side effects can be present when B12 is used at much higher doses than recommended.

B12 Vitamin Deficiency Testing

B12 Vitamin Deficiency Testing

1. Blood Clots in the Legs: This side effect can become a serious problem if left untreated. If you suspect that you are experiencing blood clots, you should seek medical assistance as soon as possible for evaluation.

2. Diarrhea: Mild incontinence can often occur as a result of medications and supplements and is often overlooked as a side effect.

3. Swelling: Swelling can occur in the area of the mouth and throat as a reaction to allergies or a full body feeling of being swollen.

4. Breathing Problems: This can be anything from a wheezing sound while breathing all the way up to shortness of breath.

5. Exhaustion: Many people who use B12, experience some fatigue but those who are dealing with the effects of too much of the vitamin are often utterly exhausted and sleep more than normal

6. Hives: Hives and other skin irritations and itching are common responses to allergy and are often overlooked on their own. If the level of acne produced by your skin goes up, there’s a strong chance that B12 is its cause.

7. Frequent Urination: B12 has been used for the purpose of losing weight; this is because B vitamins cause the body to process fats. However, consistent high levels of B12 can cause a more persistent and bothersome rate of urination.

8. Anxiety and Panic Attacks: Chest pressure, anxiety and even heart palpitations can occur as a result of too much B12 in the body.

9. Insomnia: While some people who experience extreme exhaustion will want to sleep all the time, others instead deal with the symptoms of insomnia. This does not always mean not being able to get to sleep. For some people, getting to sleep isn’t the issue; the problem lies in the ability to stay asleep long enough to get consistent restful sleep every night.

10. Dizziness and Lack of Coordination: Loss of coordination and even dizziness when combined with any of the above, warrants immediate medical attention as it could be linked to a less common side effect which could cause atrophy of the optic nerve.

If you experience any of these symptoms, it is wise to talk over them with a your doctor to determine if you need to lower your dose or if taking B12 supplements is actually necessary.

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