Airborne and Emergen-C are popular nutritional supplements. They the two have high levels regarding vitamin C, as well as other nutrients. This products claim to boost your immune system. Airborne and Emergen-C are popular nutritional supplements. They the two have high levels regarding vitamin C, as well as other nutrients. This products claim to boost your immune system. immunedefence.com Immune System Support Lozenges Zinc lozenges with rosehip and acerola Helps support the immune system and recovery from colds Suitable from 12+ years 120 aniseed flavour lozenges 3.5mg of zinc and 2.5