5 min read
Vitamin B12 in Plant-Based and Vegetarian Diets – Importance, Sources, and Supplementation
Wojciech Wiśniewski
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Diets Premium Expert • 23.10.2026
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Scientifically reviewed by a clinical dietitian:
This article has been peer-reviewed for adherence to IŻŻ, WHO, and PTGiP clinical nutritional standards.
| Diets Premium Expert Wojciech Wiśniewski | min read 5 min | Scientifically reviewed by a clinical dietitian 23.10.2026 |
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Key Takeaways
Vitamin B12 (cobalamin) is indispensable for neurological integrity, DNA synthesis, and red blood cell production. Because it is synthesized exclusively by microorganisms and found almost entirely in animal-derived foods, individuals following vegetarian and vegan diets must ensure reliable, monitored intake.
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Cobalamin as the key active form of vitamin B12
In actuality, the term vitamin B12 refers to a complex group of chemical compounds known as cobalamin, which play a crucial role in maintaining homeostasis in the body. Their primary function involves participating in the synthesis of red blood cells. It was anemia, in fact, that led to the discovery of cobalamin. It was observed that administering liver to anemic dogs accelerates their recovery to health. Initially, it was thought to be the regenerative properties of iron, but a new substance was discovered: vitamin B12. A deficiency in this vitamin is the cause of a type of anemia known as megaloblastic anemia.
Vitamin B12 and the vegetarian diet
The vegetarian diet is closely linked to the renunciation of meat as a food source. However, there are several variations of this diet, with the most restrictive being veganism, which excludes all animal products, not only meat but also eggs and milk. The main component of this diet is plant products, which unfortunately are not a source of vitamin B12 and are completely devoid of it. The human body is not capable of producing this vitamin, which is essential for the proper functioning of the body.
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Wojciech Wiśniewski
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Diets Premium team expert. Specializes in nutrition plans, strength sports, and training plans.
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