Long before commercial cold treatments, herbalists used a syrup made from the juice of one onion, mixed with honey, to alleviate congestion.
Onion is also excellent for indigestion.
Onion is believed to be a natural source of energy and some people swear that an Onion a day can prevent hair loss. According to folklore, Onion also helps restore sexual potency. Applied directly to the skin, Onion has special healing properties. A roasted Onion can be used as a poultice for earaches. Salted Onions are useful for troublesome warts.