Vitamin B-12, or Cobalamin, is the largest and most complex vitamin currently known to man. A slight deficiency of vitamin B-12 can lead to anemia, fatigue, mania, and depression, while a long term deficiency can potentially cause permanent damage to the brain and central nervous system. Vitamin B-12 can only be manufactured by bacteria and can only be found naturally in animal products, however, synthetic forms are widely available and added to many foods like cereals. Vitamin B-12 can be consumed in large doses because excess is excreted by the body or stored in the liver for use when supplies are scarce. Stores of B-12 can last for up to a year. Below is a list of the top ten vitamin b12 rich foods.

Turkey

This mega food seems to be all over health related news articles and diet recipes. It contains 1.5 plus micrograms in a 100 gram serving. This food is naturally low in fat, as long as it's eaten without the skin. Turkey usually only contains 1 gram of fat per ounce of flesh eaten. Turkey contains nutrients which have been shown to keep your cholesterol down, as well as protect against cancer and heart disease.

Eggs

When it comes to chicken eggs the raw yellow has most of the vitamin B-12 with 1.95μg per 100g serving (33%), however, this equates to 0.33μg per yolk or just 6% of the RDA. The eggs of other animals are higher with a goose egg providing 7.34μg (122% RDA) of vitamin B-12 per 100g serving, and a duck egg providing 3.78μg (63% RDA). 

Cheese

Despite being a high cholesterol food, cheese is a good source of calcium, protein, and Riboflavin (Vitamin B2). The amount of vitamin B12 in cheese depends on type and variety, Swiss cheese provides the most with 3.34μg (56% RDA) per 100g serving, followed by Gjetost (40% RDA), Mozzarella(39% RDA), Parmesan (38% RDA), Tilsit (35% RDA), and Feta (28% RDA). 

Lamb 

Lamb is a common meat in the Middle East, Mediterranean, East Asia, Australia, New Zealand, and most of Europe. Lamb is a high cholesterol food so be sure to look for lean cuts which are higher in B12 anyway. Lamb also provides high amounts of protein, and zinc. The shoulder is the cut of lamb with the most vitamin B-12 providing 3.71μg (62% RDA) per 100g serving, 5.82μg (97% RDA) per pound, and 3.15μg (53% RDA) in a 3 ounce serving. The shoulder is followed by the foreshank and leg which provides 53% of the RDA per 100g serving, and lamb chops which provide 51% of the RDA for vitmain B12 per 100 gram serving. 

Beef
In addition to being a vitamin B12 rich food, beef is also a good source of protein, zinc, and heme-iron. The amount of vitamin B-12 in beef depends on the cut, lean fat-trimmed chuck contains the most vitamin B12 with 6.18μg (103% RDA) per 100g serving, 11.49μg (103% RDA) in a chuck steak, and 5.25μg (88% RDA) in a 3 ounce serving. Chuck is followed by sirloin (62% RDA), rib-eye (60% RDA), and ribs (58% RDA). 

Crab and lobster
Crab and lobster are most commonly served baked, steamed, or in bisque. A 100g serving of crab contains 11.5μg of vitamin B12 (192% of the RDA), that is 15.4μg (257%RDA) per leg (134g). Lobster will provide 4.04μg(67% RDA) per 100g serving, or 6.59μg (110% RDA) in an average whole lobster (163g). 

Fish 

Known for their omega 3 fats and for being a high protein food, fish are also a good source of vitamin B12. Mackerel provides the most vitamin B-12 with 19μg per 100g serving (317% RDA), followed by Herring (312% RDA), Salmon (302%), Tuna (181%), Cod (167%), Sardines (149%), Trout (130%), and Bluefish (104%).   

Canned Fish Highest in Vitamin B12. 

Liver
Often appearing on the culinary scene as pâté, liver can also be prepared steamed or fried with onions and herbs. The liver of most any animal is packed with vitamin B-12, the highest on the list are: Lamb, beef, veal, moose, turkey, duck, and goose respectively. Lamb liver provides 85.7μg (1428% RDA) of vitamin B12 per 100g serving, or 72.85μg (230% RDA) in a 3 ounce serving.