Te veel vitamine B12

Too much vitamin B12

Too much vitamin B12 can be harmful to your health. But what happens if you have too much vitamin B12? Can you overdose on vitamin B12? What are the effects of too much vitamin B? How much B12 should you take? This article discusses various topics and answers questions related to these issues.

What exactly is vitamin B12?

Vitamin B12 is one of thirteen vitamins and is one of the nine water-soluble vitamins . A water-soluble vitamin is difficult for the body to store. However, vitamin B12 is an exception, as it can be stored easily. This raises the question of whether too much vitamin B12 can be harmful to health.


What is vitamin B12 good for?

Vitamin B12 is essential for good health. It influences various processes in the body.

  • The blood: The vitamin contributes to the formation of red blood cells in the body.
  • Cell division: It is good for the production of cells and tissues.
  • The energy: Vitamin B12 helps release energy from fats, proteins and carbohydrates.
  • Homocysteine: It has a beneficial role in the breakdown of homocysteine.
  • The immune system: It supports the immune system and helps ensure good resistance.
  • The psychological functions: Vitamin B12 is good for mood, learning performance, concentration and memory.
  • The fatigue: It can help reduce the lack of energy that comes with fatigue.
  • The nervous system: It has a positive effect on the functioning of the nervous system.

Too much vitamin B12

What happens if you have too much vitamin B12? Too much vitamin B12 is uncommon in the Western population. Research shows that too much vitamin B12 can be harmful to health. When someone consumes more vitamin B12 than their body can process, it can lead to various health problems, including diarrhea, fatigue, dizziness, and headaches. Therefore, it's important to ensure they don't consume more vitamin B12 than their body needs. However, this rarely, if ever, occurs in the Western population.


Vitamin B12 deficiency

However, vitamin B12 deficiency is much more common. More than half a million adults in the Netherlands suffer from a vitamin B12 deficiency, and the consequences can be very harmful to their health. Population groups at increased risk include:

  • Vegetarians who consume very little dairy products and eggs
  • Vegans
  • People who consume excessive alcohol
  • People who suffer from chronic inflammation of the gastric mucosa
  • People who suffer from a bowel disease
  • People who use long-term medication