Scientists debunk six of seven popular cold-fighting home remedies

A team from the University of Zurich has reviewed seven popular home remedies to see if they help fight colds. Led by researcher Jakob Nilsson, the study found little strong evidence behind most claims. Only one method showed clear benefits in reducing infections and sick days. The review checked remedies often recommended for cold prevention. Drinking lemon water in the morning, despite its reputation, does not strengthen the immune system. Raw onions, another common suggestion, also lack proof of any protective effect.

Eating aged garlic extract, at a daily dose of 2.56 grams, may ease cold symptoms. However, the evidence is not strong enough to confirm it prevents illness. Astaxanthin capsules, sometimes promoted for immunity, might increase certain immune cells, but their impact on actual illness remains unclear. Intermittent fasting was examined for its potential to reduce inflammation through autophagy. While it may have some benefits, it does not prevent infections. Fasting for more than 48 hours can even be harmful. Nose breathing, often claimed to lower inflammation, has no reliable studies proving it stops colds. Group drumming showed mixed results in research. Some studies suggest it could support immune defence, but findings are inconsistent. Ice bathing alone was found to be less effective and risky. However, when combined with breathing exercises, it showed the strongest evidence for cutting sick days and preventing infections. The team noted that their search did not uncover high-quality scientific studies for most remedies. This limits how much confidence can be placed in their effectiveness.

Out of the seven remedies, only ice bathing with breathing techniques had solid scientific backing. The review highlights a lack of strong research for most home treatments. People looking to avoid colds may need to rely on more proven methods until further studies are done.