Vitamin supplements and multivitamins are used to prevent or treat nutritional deficiencies, providing the body with the essential micronutrients required for optimal functioning when dietary intake is insufficient. Their primary advantages include filling critical nutritional gaps, boosting immune system function, and supporting metabolic and structural health, such as strengthening bones, improving energy levels, and aiding in cellular repair. By delivering targeted doses of specific nutrients like Vitamin D, B12, or folic acid, these supplements are highly preventative and restorative, helping to avert chronic conditions like anemia or osteoporosis while safely supporting the body through high-demand life stages such as pregnancy, healing, or aging.