Apples contain high amounts of vitamin C. It is a powerful natural antioxidant that can help increase resistance to disease. you get a healthy dose of the essential vitamin. B-complex vitamins are also found in apples. It also contains riboflavin, thiamine and vitamin B-6, which are essential for maintaining red blood cells and keeping your nervous system strong and healthy. Apples also contain vitamin K. This vitamin helps make proteins that strengthen your bones and promote normal blood clotting. Vitamin E is found in smaller amounts in apples compared to other vitamins. However, this vitamin contributes to healthier skin and a stronger immune system.