Vitamin E
Vitamin E is rich in antioxidants, which plays a key role in removing toxic chemicals from the body. Vitamin E is necessary for balancing hormonal level. It lowers the rate of effectiveness of estrogen in breast tissues and also deals with unnecessary fats. So any sort of Vitamin E deficiency causes obesity which is a prime factor which may lead towards gynecomastia. Vegetable oils, seeds, green vegetables are rich source of vitamin E.