Cold Zyme Mouth Spray Cold Zyme Mouth Spray makes it harder for the common cold virus to cause illness, & when used in the early stages of an infection it shortens the duration of the cold. Cold Zyme Mouth Spray forms a protective active enzyme barrier on the mucous membrane in your throat, which is where the cold virus takes hold & multiplies. This barrier traps the cold virus, disables its ability to bind in to human cells & helps your body to remove them naturally. The enzyme used is psychrophilic trypsin which has been clinically documented to be effective against the common cold. Cold Zyme Mouth Spray is suitable for adults & children over 4 years. It is free from sugar & preservatives. Each bottle of Cold Zyme Mouth Spray contains 55 doses.