Chapter 53: Vitamins and Minerals

Vitamins are organic compounds required in minimal quantities to support metabolism, growth, and cellular repair, while minerals are inorganic elements that serve as cofactors, electrolytes, and structural components throughout the body. Fat-soluble vitamins including retinol, cholecalciferol, tocopherols, and phylloquinone are absorbed with dietary fat and stored in hepatic tissue, making them subject to accumulation and potential toxicity. Retinol maintains visual function and epithelial tissue integrity but carries teratogenic risks at elevated doses. Cholecalciferol regulates calcium and phosphorus homeostasis, preventing metabolic bone disease. Tocopherols function as antioxidants with unclear cardiovascular benefits. Phylloquinone is critical for coagulation factor synthesis and serves as an antidote for anticoagulant overdose. Water-soluble vitamins including thiamine, riboflavin, niacin, pyridoxine, cyanocobalamin, and ascorbic acid are not stored in significant quantities and must be regularly replenished through diet or supplementation. These compounds participate in enzymatic energy production, red blood cell formation, and collagen synthesis. Deficiency states produce characteristic clinical syndromes such as beriberi from thiamine depletion, pellagra from niacin insufficiency, pernicious anemia from cyanocobalamin malabsorption, and scurvy from ascorbic acid deficiency. Wernicke's encephalopathy emerges as a neurological emergency requiring immediate thiamine replacement. Mineral supplementation addresses deficiencies in calcium, magnesium, phosphorus, and zinc, supporting bone mineralization, enzymatic function, neuromuscular transmission, and tissue repair. The chapter discusses therapeutic megadosing applications such as using niacin for dyslipidemia and pyridoxine with certain antimicrobial agents, balanced against documented toxicity risks. Nursing responsibilities encompass dietary intake assessment, monitoring serum nutrient levels, differentiating elemental versus salt forms in supplement formulations, preventing adverse drug interactions, and educating patients about food sources, deficiency recognition, and safe supplementation practices. This integration of nutritional science with clinical pharmacology prepares nursing professionals to provide comprehensive, evidence-based patient care.