The role of vitamins in metabolic processes is essential as they act as cofactors or coenzymes in various biochemical reactions. They enable enzymes to function efficiently, facilitating processes such as energy production, cell growth, and repair. Additionally, vitamins play a significant role in the regulation of metabolic pathways, contributing to the synthesis of hormones and neurotransmitters. Deficiencies in vitamins can disrupt these processes, leading to various health issues. Thus, they are crucial for maintaining overall metabolic health and supporting physiological functions in the body.