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Major sources include: Foods Rich in Vitamin B12 Vitamin B12 is naturally found primarily in animal-based foods, such as: Beef liver and pork liver (the most concentrated sources) Red meat, poultry, and fish Eggs, especially egg yolks Shellfish such as clams and oysters Fatty fish like salmon, tuna, and sardines Dairy products including cows milk, yogurt, and cheese For individuals who follow a vegetarian diet, Vitamin B12-fortified foods can be a helpful choice, such as fortified cereals or fortified soy milk

Or scientists can make it in a lab

Hydroxocobalamin detoxifies cyanide by binding with it to form the renally excreted, nontoxic cyanocobalamin

Heres another question that often pops up: How long does a B12 shot last