Inc is considered an essential mineral and part of the daily recommended allowance.

But before the 19 sixties, the idea of including zinc in the diet was controversial.

The discovery of zinc scroll and immunity was largely due to a hematologist named Dr Prasad.

He studied a group of young Egyptian men with dwarfism.

He suspected that their diet lacks zinc and when he gave the men supplements, they grew about six inches taller.

If you want to learn more about zinc and its effect on the common cold, check out the episode here.