Vitamin C 1000 mg: 1 tablet 1–2 times per day or as directed by a health professional. Vitamin D3 50 mcg (2000 IU): 1 softgel 1–3 times per day for adults or as directed by a health professional. Quercetin LipoMicel Matrix: 1 softgel per day with food or as directed by a health professional. Zinc Citrate: 1 tablet per day or as directed by a health professional.