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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

Journal (Journal of Applied Physiology, 2011, 110(3), 774780)

A small tripeptide just three amino acids (glycine-histidine-lysine) bound to a copper ion appeared to make old liver tissue behave like young tissue

Its activity in structural, vascular, dermatological, and systemic models provides a foundation for exploring diverse aspects of regenerative biology