Is it a myth or does it really work?
Onion (Allium cepa) possesses expectorant properties and has effective germicidal properties. On account of its content of a volatile oil, the onion is very useful in respiratory disorders. The onion dislodges mucus and prevents its fresh formation. It liquifies phlegm and prevents its further formation. It has been used as a food remedy for centuries in cold, cough, bronchitis and influenza. Onions relieve nasal and chest congestion. Onions also induce perspiration. Several anti-inflammatory agents in onion render them helpful in reducing the severity of symptoms of the respiratory congestion associated with the common cold. Onion contains compounds that inhibit lipoxygenase and cyclooxygenase (the enzymes that generate inflammatory prostaglandins and thromboxanes), thus markedly reducing inflammation. Onions’ anti-inflammatory effects are due not only to their vitamin C and quercitin, but to other active components called isothiocyanates. These compounds work synergistically to spell relief from inflammation.