To maintain adequate levels of vitamin B12, consider consuming the following foods:

Organ Meats: Liver (especially beef or lamb liver) is one of the richest sources of vitamin B12.
Shellfish: Clams, mussels, and oysters contain high amounts of B12.
Fish: Salmon, tuna, and trout are excellent sources.
Beef: Lean cuts of beef provide a good amount of vitamin B12.
Dairy Products: Milk, cheese, and yogurt contain moderate levels of B12.
Eggs: A valuable source of B12, especially in the yolk.
Fortified Foods: Some breakfast cereals, plant-based milks, and nutritional yeasts are fortified with B12.
Conclusion
Vitamin B12 is essential for overall health, particularly for red blood cell production and neurological function. A deficiency can lead to serious health complications, so it is important to consume adequate amounts through diet or supplements if necessary. Those at risk, such as vegetarians, older adults, and individuals with digestive disorders, should monitor their B12 levels and consult a healthcare professional if symptoms arise. Maintaining a balanced diet with B12-rich foods is the best way to prevent deficiency and support long-term health.