Onion peels, often discarded, offer a surprising array of benefits thanks to their rich content of antioxidants, vitamins, and minerals. Packed with flavonoids like quercetin and phenolic compounds, onion peels possess potent antioxidant and anti-inflammatory properties that can support cardiovascular health, boost the immune system, and reduce inflammation. By incorporating onion peels into broths, teas, or compost, you can make the most of these versatile, nutrient-rich scraps.