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Vitamin B12 is fairly non-toxic, but some rare side effects include:

* Diarrhea * Blood clots in the legs * Feeling of swelling around the entire body * Hives or rash* * Itching* * Swelling of lips, mouth of throat* * Difficulty breathing* * Signs of an allergic reaction

You may also experience toxic effects from the inactive ingredients in the supplement.

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14y ago
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11y ago
Primary Side Effects
  • The primary physical side effects of taking too much B12 include mild diarrhea, skin rashes, hives, breathing problems and heart palpitations. Symptoms are typically mild and disappear within 24 hours after ingestion. The side effects are more common when the vitamin is administered through injection.

Secondary Side Effects
  • Vitamin B12 can have negative psychological side effects. They include panic, anxiety attacks and insomnia. These side effects can lead to breathing problems and heart palpitations created by panic and anxiety. The symptoms typically disappear within a few hours, as the excess B12 is flushed from the system.

Rare Side Effects
  • People considering B12 supplements should consult their family medical history for any occurrence of Leber's disease, a hereditary condition that causes the optic nerve to atrophy. Large doses of B12 can lead to an early onset of the disease or cause the optic nerve to atrophy more rapidly.

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13y ago

For starters, let's just say there's a reason people refer to the B complex vitamins.

B12 is involved in several different processes within the body, including the synthesis of DNA and fatty acids. However, one of its major functions is to regenerate folate within the body, and as long as there is sufficient folic acid (vitamin B9) present, many B12 deficiency symptoms will not show up.

There are two major places where adequate folate will not compensate for B12 deficiency, and both of them involve the nervous system... specifically, the myelin sheath around nerve fibers. Ultimately this results in degeneration of the brain and spinal cord. Also, a chemical pathway leading to the synthesis of certain neurotransmitters requires vitamin B12 in order to work properly.

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11y ago

Vitamin B12 toxicity is uncommon. See related link for a discussion.

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14y ago

B6 is toxic in overdose.

Your urine will turn bright yellow, and you will smell like excessive vitamin B.

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9y ago

Your kidneys get bothered to excrete those extra vitamins. Unfortunately, so many vitamin B-complex preparations in market has got extra vitamin B-complex.

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Q: What are the side effects of too much vitamin B12?
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Related questions

Can b12 vitamin increase the size of your neck?

No its not true. There is no such side effects of vit b12 vitamin.


Is B12 a vitamin or a mineral?

B12 is a vitamin


Is b12 bad for you?

If you are referring to vitamin b12, vitamin b12 is healthy for you.


Which vitamin B12 supplement is best?

Satvam Vitamin B12 Tablets helps you improve digestion and liver functioning without any side effects on an everyday basis. It contains essential Amino Acids, Calcium, Magnesium, Multivitamins and Multiminerals that enable you to stay energetic and healthy.


Where can you find vitamin B12 naturally?

Simple, Eat Meat. This is the reasons why vegetarians are much more likely to get vitamin B12 deficiency.


Is 2000mcg of vitamin B12 too much daily?

no


Has anyone noticed any side effects in cats after a vitamin B12 shot?

You may notice the side effects most common to any injection - swelling, redness, mild pain at the injection site. The muscle may be stiff and the cat may not be as willing to move for a day or so. Vitamin B12 is the treatment for pernicious anemia, which is often secondary to chronic intestinal disease or chronic blood loss. As the B12 is absorbed, your cat may have an increased appetite and increased energy.


Has there been problem with gastric bypass?

There are various side effects that can be caused by gastric bypass including stomach ulcers, gallstones, iron and vitamin B12 deficiency, nausea and vomiting.


Does b12 have barbiturate?

No, vitamin B12 is not a barbiturate


How many international units of Vitamin B12 are in 1000mcg of vitamin B12?

one milliliter


Pernicious anemia is due to lack of what vitamin?

Perncious anemia is caused by the body's inability to absorb the vitamin B12 from the gastrointestinal tract, due to a loss of gastric parietal cells. Regular B12 supplementation can keep pernicious anemia at bay, though it is not a complete cure. B12 is a vitamin obtained from meat and dairy products.


Explain the relation between vitamin b12 and pernicious anemia?

first of all its called vitamin b12 deficiency anemia. Pernicious anemia and vitamin B12 deficiency anemia are the same thing. Pernicious anemia is caused by a lack of vitamin B12. You're not able to absorb the vitamin B12 due to the absence of intrinsinc factor.