Vitamins with Deficiency Our body needs vitamins for growth, immunity, skin, bones, and energy. Lack of vitamins can cause many health problems. Vitamin A – Deficiency causes night blindness, dry skin, weak immunity. Vitamin B1 – Deficiency causes beriberi, weakness, nerve problems. Vitamin B2 – Deficiency causes mouth cracks, skin issues. Vitamin B3 – Deficiency causes pellagra. Vitamin B6 – Deficiency causes anemia, skin rash. Vitamin B12 – Deficiency causes fatigue, anemia, nerve damage. Vitamin C – Deficiency causes scurvy, bleeding gums, low immunity. Vitamin D – Deficiency causes weak bones, rickets. Vitamin E – Deficiency causes muscle weakness. Vitamin K – Deficiency causes bleeding problems. Eat a balanced diet with fruits, vegetables, milk, eggs, nuts, and sunlight exposure for Vitamin D.