ET Panache NEWS Powered by Hoarding up on zinc, vitamin C supplements to boost immunity? They may not be effective in treating Covid SECTIONS Hoarding up on zinc, vitamin C supplements to boost immunity? They may not be effective in treating CovidPTI Last Updated: Feb 16, 2021, 05:40 PM IST Share iStock Related WASHINGTON: Taking zinc or vitamin C supplements does not significantly decrease the severity or duration of symptoms in COVID-19 patients, when compared to standard care, according to a study. Researchers at Cleveland Clinic in the US noted that zinc is known to be important for immune function, with a role in antibody and white blood cell production and fighting infections.