Can Raw Onions Under Your Feet Really Treat a Cold?

Claims that placing raw onions beneath the feet can cure a cold or draw toxins out of the body continue to circulate on social media. But there is no reliable scientific evidence that the practice treats colds or other infections.

The supposed remedy rests on the idea that onions can absorb harmful substances through the soles of the feet. That is not how the body removes waste: the liver and kidneys play central roles in processing and eliminating it.

Onions can be part of a healthy diet, but their nutritional value does not make them an effective treatment when applied to the skin. Nor does research into the properties of onion compounds establish that a slice placed against the foot can fight an infection.

Colds are caused by viruses, and most improve on their own. Rest, fluids and appropriate symptom relief can help people feel more comfortable while they recover; placing onions under the feet has no proven benefit.

Raw onion may also irritate the skin, especially with prolonged contact. Anyone with severe, persistent or worsening symptoms should seek medical advice rather than rely on a social media remedy.