Packed with Vitamins B6 and C, iron, magnesium and calcium, onions, raw and cooked, are a delicious part of many Indian dishes. Onions are anti-bacterial and antiseptic and help keep you free from infections. Mixing some honey with onion juice is a home remedy that acts as a cough syrup that relieves coughs and sore throats. If you suffer from insomnia, adding an onion to your daily diet can help cure you of your sleeplessness. It also helps control the blood sugar levels in the body. Finally, onions help in reducing the bad cholesterol in your body.