Vitamin B12 has gained prominence, especially due to veganism: The link between vitamin B12 deficiency and a vegan diet has become a kind of common knowledge. Almost as well-known are the numerous vegan sources of vitamin B12, such as algae, fermented products, sprouts, herbs, or mushrooms, as well as various other methods through which vegans are said to meet their vitamin B12 needs. Iris Berger puts common myths about vitamin B12 supply in vegan diets to the test and examines which options for meeting the requirement exist and which should be dismissed as outdated, uncertain, or non-existent. Berger aims to clarify the sometimes opaque and convoluted information surrounding vitamin B12, which is disseminated by both pro-vegan advocates and nutritional institutions.