The role of vitamins in the body should not be underestimated. One of the most popular and commonly supplemented vitamins is B12, also known as cobalamin. A deficiency of this vitamin can have serious health implications. It plays a role in carbohydrate, protein, and fat metabolism, as well as many other important processes. Vitamin B12 is only found in animal products such as meat and dairy products. For this reason, vegetarians and vegans are particularly at risk of deficiency. In the case of a vegan diet, nutritionists agree that supplementation with vitamin B12 is essential for maintaining good health. Older people, especially those with stomach acid problems, often suffer from deficiencies as well. There are many supplements on the market that contain cobalamin. Many people wonder which product they should choose. To make your decision easier for you, we have created a ranking of the top 5 over-the-counter vitamin B12 supplements.