O2B Quercetin Plus

O2B Quercetin Plus is a comprehensive antioxidant and immune-support formula combining quercetin, NAC, MSM, vitamin C, zinc and vitamin D. This formula was developed to support those struggling with symptoms of long covid or chronic fatigue. Quercetin is a naturally occurring plant flavonoid valued for its antioxidant activity and impact on mast cells as part of a healthy immune response. NAC supports the body’s production of glutathione and normal respiratory mucus clearance, while vitamins C and D and zinc contribute to normal immune-system function.