Zinc for common cold

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While I am searching the interesting articles regarding chemistry, I have found this article

in COHRANE LIBRARY, that they mentioned a detailed study about the consumption of Zinc, a mineral commonly available through food items, is also playing a vital role to decrease the intensity of common cold.

In our laboratory, my Professor, Dr. P.K.Dubey always suggest us to use KMnO4 for any infections

like cold, throat and skin allergy, here I find medical use zinc and .........  

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