Vitamin A?????????????????????????????…

It's an antioxidant vitamin which is converted to a visual pigment in the retina, so deficiency can result in inability to see in dim conditions. It's fat soluble. Strictly speaking, it's only found in animal products, particularly liver, but yellow and red vegetables and fruits often contain it in the form of beta carotene or other carotenoids, which are converted to vitamin A by the body. There is no feedback mechanism on this process, which is important because vitamin A can be toxic in large doses and therefore the same applies to carotenoids. It also keeps skin healthy and prevents acne. Deficiency symptoms include night blindness, susceptibility to the complications of measles, dry eyes, cataracts and horny skin.