A food supplement. Do not exceed the recommended dose, as too much vitamin C can cause stomach upset and too much zinc over time can lower copper levels. Effervescent tablets contain sodium. Take care if you are on a low-salt diet or have high blood pressure. Take a couple of hours apart from certain antibiotics, which zinc can affect. If pregnant, breastfeeding or on medicines, ask first. Store in a cool, dry place. This product information is for general guidance only and does not replace professional medical advice. Keep out of reach of children.