Vitamin A is a key component in the synthesis of rhodopsin, which helps the eyes adapt to dim light and prevent night blindness and vision loss. Many eye health supplements contain vitamin A, often in combination with lutein, beta-carotene, and other ingredients.

Vitamin A maintains the integrity of epithelial tissues in the respiratory, digestive, and urinary tracts, enhancing the body's ability to resist pathogens. Therefore, it is widely used in health foods to boost immunity and is suitable for people with weakened immune systems.

Vitamin A plays an important role in bone development, tooth growth, and reproductive health in children and adolescents. Therefore, it is commonly found in children's growth formulas and maternal supplements.

Vitamin A helps maintain the normal function of the skin and mucous membranes, promotes cell metabolism, and prevents dry and rough skin. Some beauty supplements contain vitamin A, emphasizing its "inside-out" skincare benefits.

Vitamin A and its precursors (such as beta-carotene) possess certain antioxidant properties, helping to mitigate free radical damage to cells and slow aging. They are commonly found in nutritional supplements for middle-aged and elderly individuals.