Clams are the richest source of vitamin B12, with 100 grams of cooked clams containing more than 1,000% of the recommended daily intake of vitamin B12.
Fortified breakfast cereals
Many breakfast cereals are fortified with vitamin B12, providing up to 100% of the recommended daily intake in a single serving.
Salmon is a good source of vitamin B12, with a 100-gram serving providing about 80% of the recommended daily intake.
Salmon
Tuna
Tuna is also a good source of vitamin B12, with a 100-gram serving providing about 25% of the recommended daily intake.
Cheese is also a good source of vitamin B12, with a 100-gram serving of Swiss cheese providing about 52% of the recommended daily intake.