Vitamin B12: overdosing can increase the risk of cancer

Until now, the principle has been that water-soluble vitamins such as B12 cannot be overdosed - the body excretes too much. The German Nutrition Society (DGE) also recently raised its recommendation for B12 intake. However, an international comparative study now shows that long-term overdoses of B12 increase the risk of lung cancer, especially in smokers. So how much is optimal?

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via Sabrina
07/03/2019, 11:57
53 Prozent der B12-Mängel liegen an einer schlechten Aufnahme im Darm© iStock
Controlled intake: 53 percent of B12 deficiencies are due to poor absorption in the intestine

Vitamin B12 daily requirement

According to the DGE, adults need four micrograms of B12 a day - as much as is contained in 200 grams of beef. However, this amount just covers the requirements of a young, healthy woman. Anyone who is chronically ill, under stress, drinks or smokes needs considerably more. Vegans must always take the vitamin because it is almost exclusively contained in animal products.

Blood test shows vitamin requirement

The personal requirement can be determined by a doctor - preferably using the "Holo-TC" blood value. If this is in the lower half of the laboratory norm, you should take B12 or have it injected. Annual checks are important to ensure that the upper standard limit is not greatly exceeded in the long term. This also prevents the risk of cancer.


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