Onion (Allium cepa) is a powerful culinary medicine packed with thiosulfinates (sulfur compounds) and the potent flavonoid antioxidant quercetin. The sulfur compounds act as natural expectorants and mucolytics, thinning thick bronchial mucus and calming hyperactive cough reflexes. Quercetin provides systemic anti-inflammatory, antihistamine, and cardiovascular support by stabilizing blood vessels and inhibiting inflammatory enzymes.
Educational information only — never stop or change a prescribed medication without talking to your prescriber first.
CRITICAL: Do not give onion-honey syrup to infants under 1 year of age due to the risk of botulism from raw honey (use maple syrup or sugar instead). Large amounts of raw onion can cause gastric reflux or mild digestive upset.
Evidence level: Moderate
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