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Vitamin A (Retinol)

Vitamin A is a fat-soluble vitamin that plays an important role in many bodily functions, including vision, immune function, and cell growth and differentiation. It is found naturally in a variety of foods, including animal liver, dairy products, and orange and yellow fruits and vegetables. Vitamin A deficiency can lead to a wide range of symptoms, including night blindness, dry skin, and impaired immune function. In severe cases, vitamin A deficiency can lead to blindness and increased susceptibility to infections. Vitamin A toxicity can also occur with excessive intake of vitamin A supplements or consuming high amounts of animal liver, which is particularly high in vitamin A. Symptoms of vitamin A toxicity can include nausea, vomiting, and headache, as well as more serious symptoms such as liver damage and bone loss.