Nutritional Snapshot (Per 100g raw onion)
Vitamin C: 7.4 mg (supports immunity)
Quercetin: High levels (a potent anti-cancer flavonoid)
Organosulfur compounds: Unique to alliums (garlic, onions)—linked to heart and metabolic health
Fiber: 1.7g (feeds gut bacteria)
Low calorie: Just 40 calories per serving
Fun fact: Red onions contain the highest quercetin levels—up to 3x more than yellow or white!