Shellfish are excellent sources of vitamin B12, with clams being particularly high in this nutrient.
Liver, especially from animals like beef, lamb, and chicken, is a nutrient-dense superfood rich in vitamin B12. It's also a good source of other B vitamins, iron, and protein.
Fatty fish like salmon are not only rich in omega-3 fatty acids but also contain significant amounts of vitamin B12.
Eggs are a versatile and convenient source of vitamin B12. The yolk, in particular, contains this nutrient.
While most plant-based foods don't naturally contain vitamin B12, some are fortified with it. These include plant-based milk alternatives (such as soy milk, almond milk, and oat milk), breakfast cereals, nutritional yeast, and meat substitutes.