vitamin C + quercetin

Vitamin C + quercetin is a combination dietary supplement that includes two bioactive compounds—vitamin C (ascorbic acid) and the flavonoid antioxidant quercetin. This combination is designed to support immune system function, provide antioxidant protection against oxidative stress, promote healthy histamine response, and support cardiovascular health. - **Vitamin C** acts as an essential nutrient involved in collagen synthesis, iron absorption, immune defense modulation (including supporting various cellular functions of both the innate and adaptive immune system), and as a potent antioxidant scavenging reactive oxygen species. - **Quercetin** is a plant-derived flavonoid found in foods like apples and onions; it exhibits anti-inflammatory effects by modulating inflammatory mediators (such as cytokines), stabilizing mast cells to reduce histamine release (supporting allergy relief), inhibiting lipid peroxidation through its antioxidant activity, and potentially influencing cellular transporters affecting drug metabolism[1][2][5]. The combination may enhance the bioavailability of each component; for example, vitamin C can improve the absorption of quercetin[5]. Some formulations use advanced delivery systems such as phytosomes or cyclodextrins to further increase absorption[2][5]. The product is marketed primarily for general wellness benefits including immune support but has also been discussed in contexts such as respiratory health/allergy management[3][5] or adjunctive use during viral infections like COVID-19[6].

Brand names

Vitamin C With QuercetinVitamin C and Bio-QuercetinQuercetin & Vitamin CQuercetin with Vitamin C Extra Strength

Other names

vitamin C plus quercetinascorbic acid + quercetinvitamin C and quercetin