Vitamins are absorbed and utilized by the body through a complex process involving the digestive system. After ingestion, vitamins are released from food in the stomach, then absorbed in the small intestine, often aided by fat for fat-soluble vitamins (A, D, E, K). Water-soluble vitamins (B-vitamins and C) directly enter the bloodstream. Once absorbed, vitamins are transported to various cells, where they play essential roles in metabolism, energy production, and immune function. Proper dietary intake is vital for ensuring adequate vitamin levels to support overall health.