Watsons Vitamins C 100 mg plus zinc 10mg tab is an orange flavoured effervescent tablet. It is a dietary supplement. RDA is recommended Daily Allowance. it was established for the purpose of ensuring adequate levels in the diet. This product contains more than 100% of RDA of vitamin C and 67% of the RDA of Zinc. Dosage: Adults and adolescents over 12 years: 1 tablet daily with food or as directed by a physician or pharmacist.