Vitamins are essential micronutrients that the human body requires in relatively small amounts to maintain normal physiological functions, growth, development, and overall health. There are 13 recognized vitamins, including vitamins A, C, D, E, and K, in addition to the B-complex vitamins such as thiamine (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxine (B6), biotin (B7), folate (B9), and cobalamin (B12). Although vitamins are required in small quantities, their deficiencies can lead to significant health problems. Vitamin A is essential for maintaining normal vision, healthy skin, epithelial tissues, immune function, and normal growth. Important sources include liver, eggs, dairy products, and vegetables rich in carotenoids, such as carrots, spinach, and other green and orange vegetables. Vitamin A deficiency remains an important public health problem in some populations and may contribute to impaired vision and increased susceptibility to certain infections. The B-complex vitamins play important roles in energy metabolism and the metabolism of carbohydrates, proteins, and fats. They are also involved in nervous system function and blood cell formation. Vitamin B12 is particularly important for normal red blood cell production and neurological function, while folate (vitamin B9) is essential for DNA synthesis and cell division. B vitamins are found in a variety of foods, including whole grains, legumes, meat, eggs, dairy products, and leafy green vegetables. Vitamin B12 occurs naturally mainly in foods of animal origin. Vitamin C is an important water-soluble vitamin involved in collagen synthesis, wound healing, tissue maintenance, and normal immune function. It also improves the absorption of non-heme iron from plant-based foods. Good dietary sources of vitamin C include citrus fruits, strawberries, kiwifruit, tomatoes, broccoli, and red or green peppers. Vitamin D is particularly important for bone and dental health because it contributes to calcium absorption and normal mineral metabolism. The body can produce vitamin D following exposure to sunlight, while dietary sources include fatty fish and fortified foods. Some individuals may require vitamin D supplementation depending on their nutritional status and medical circumstances. Vitamin E acts as an antioxidant and contributes to protecting cells from oxidative damage. Good sources include nuts, seeds, vegetable oils, spinach, and other green vegetables. Vitamin K is essential for normal blood clotting and also contributes to bone health. Green leafy vegetables are among the richest dietary sources of vitamin K. In conclusion, adequate vitamin intake is an important component of a healthy lifestyle. The best approach to meeting vitamin requirements is generally a balanced and diverse diet containing fruits, vegetables, whole grains, legumes, nuts, seeds, and healthy protein sources. The World Health Organization emphasizes dietary diversity as an important strategy for meeting micronutrient requirements and preventing nutritional deficiencies. Vitamin supplements may be useful when a deficiency or increased nutritional requirement is present, but they should not replace a balanced diet. Excessive intake of some vitamins, particularly through unnecessary supplementation, may have adverse health effects; therefore, supplementation should be considered according to individual needs and preferably under professional guidance. Al-Mustaqbal University the First in Iraq