Zinc and Vitamin C contribute to the normal functioning of the immune system, while Riboflavin helps maintain the normal state of the mucous membranes. (The above are official health claims by the European Food Safety Authority (EFSA)).

Vitamin C is in the form of ascorbate, not in the form of ascorbic acid so that the ph of the oral mucosa is neutral and the teeth are not damaged.
Zinc is in the form of zinc citrate because it is more soluble and absorbable than mucous membranes.
These caramels are suitable for children and adults who find it difficult to swallow capsules and tablets.