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ORIGINAL RESEARCH

Evaluating the Efficacy and Safety of EZC Pak, a 5-Day Combination Echinacea-Zinc-Vitamin C Dose Pack with or without Vitamin D, in the Management of Outpatient Upper Respiratory Infections

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Pages 2561-2572 | Received 02 Nov 2022, Accepted 16 Mar 2023, Published online: 03 May 2023

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