It is useful in various diseases. The odour in onion is due to organic sulphur compounds, and is produced only when the tissues are cut or injured by enzyme action on a water-soluble amino acid. Heat or freeze-drying prevents, the enzymes action, so that cooking produces a different odour, flavour and pungency. Onions are noted for their easily assimilable iron content. They are, there fore, beneficial in treating Anaemia.
Onions are very effective in bleeding piles.
About 30 grms of onions should be finely ground on a slab with water and 60 grms of sugar added to it. Taken twice daily this brings relief within a few days. Onion is irritating to the skin and stimulates the circulation of blood in the mucous membranes. Warts sometimes disappear when rubbed with out onions. It is established that in recent researches in the west, onion as an effective preventive edible against heart attack.