Vitamin B12 Side Effects

Vitamin B12, which is also known as cobalamin, plays a leading role in the standard functioning of nervous system, brain, and the creation of red blood cells. This vitamin is associated with every cell of your body, influencing DNA synthesis, amino acid metabolism, and fatty acids. It has been reported that B12 deficiency exists in almost 30% adults all around the world. This shortcoming leads to chronic fatigue and the incompetency of the brain to function properly. Not just that, but the deficiency of vitamin B12 is known for causing various other problems as well. This vitamin is found in bacteria and archaea that support the enzymes necessary for its synthesis.


You can quickly consume Vitamin B12 by taking animal products, such as dairy products, fish, and meat. Moreover, there are also some of the supplements present in the market through which you can consume Vitamin B12. This vitamin can also be produced in laboratories by using bacterial fermentation-synthesis. However, it has been noted that excessive consumption of Vitamin B12 can lead to some of the severe health problems. If this vitamin has benefits, then it has side effects as well. Scroll down and make yourself familiar with the Vitamin B12 side effects.

Vitamin B12 Side Effects

The B12 supplements are known for treating the deficiency of vitamin B12. But, the side-effects of Vitamin B12 are hard to neglect. One of the active ingredients in Vitamin B12, Cyanocobalamin, may become the reason behind the unwanted health problems.

Weakness and Fatigue

Vitamin B12 undoubtedly increases metabolism. However, low consumption of B12 can create a reduction in the production of red blood cells, which can result in weakness, dizziness, and confusion. These signs are quite unclear and universal; hence, people don’t find it necessary to get it tested. If you feel these symptoms for more than a week, then it is better to consult a doctor soon.

Suppressing the Production of Stomach Acid

Stomach Acid is necessary to absorb the Vitamin B12. And, the excessive consumption of B12 may result in the reduced production of stomach acid, which in turn can cause Vitamin B complex side effects.

Neurological Problems

The neurological problems, such as memory loss, the problem in reasoning and thinking, disorientation, etc. can also occur because of the side-effects of Vitamin B12. Most of the times, people misconstrued these neurological problems with Dementia. Not just in older folks, but in youngsters as well, these problems are quite evident.

Delayed Development in Infants

Yes, vitamin B12 can have adverse effects on children as well. As far as the infants are concerned, then they may encounter a delay in development, which can affect their overall health as well as internal organs.

Cardiovascular Effects

Congestive heart failure, peripheral vascular thrombosis, and pulmonary edema are some of the cardiovascular side-effects caused by parenteral cyanocobalamin present in Vitamin B12.


Being one of the eight B-complex vitamins, vitamin B12 is a water -soluble vitamin. This vitamin can be found in different food items, such as Poultry, Fish and Shellfish, Eggs, Fortified breakfast cereal, Milk Products, Yogurt, and Meat. If you take this vitamin via a proper diet, then there won’t be any need to consume supplements; hence, there will be minor side-effects.

There are different types of supplements that you can easily get your hands on. Chances are if you don’t know anything about the repercussions of these vitamin supplements, then you may have to face some hassles. Therefore, it is always recommended to check before you use.

Being a healthy adult, it is recommended to consume 2.4 micrograms of Vitamin B12 every single day. However, if you are unable to consume it through a nutritious diet and can feel these symptoms mentioned above, then either you can start taking supplements, or contact the nutritionist.

Moreover, there are different ways of using vitamin B12 as well, such as oral, injections, or lotion. You can intake this supplement according to your comfort level. Howbeit, taking up this vitamin orally can result in mild side-effects.

So, it was all about Vitamin B12 side-effects. Make the right choice.

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