Eat animal liver
Eat beef
Eat lamb
Eat pork
Eat chicken
Eat turkey
Eat fish
Eat salmon
Eat tuna
Eat sardines
Eat trout
Eat shellfish
Eat clams
Eat mussels
Eat oysters
Eat eggs
Drink milk
Eat yogurt
Eat cheese
Eat fortified foods
Eat fortified breakfast cereal
Eat fortified plant milk
Eat fortified nutritional yeast
Eat fortified meat alternatives
Use B12 supplements if you do not eat animal products