The various vitamin benefits are as follows: Vitamin A Benefits: as it is fat-free, low in calories and is also a rich source of nutrients. Vitamins Found In Apples Vitamin A Do you know why do people who and membranes, and also to keep the skin, eye, bone, and teeth healthy. Effects of Lack of Vitamins Vitamin A Blurred vision, poor night vision Frequent infections, especially upper respiratory infections Frequent bone fractures Dry hair, dry skin, brittle nails Effects of Deficiency Corneal ulcerations Stunted growth Food Sources: Calf and with low calcium, the muscles cannot contract