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  1. 5 Vitamins To Boost Your Immune System - Cleveland Clinic …

  2. Vitamin C: Benefits and How Much You Need - Cleveland Clinic …

  3. Vitamin C and Immune Function - PMC - PubMed Central (PMC)

  4. How Vitamin C Supports a Healthy Immune System - Academy of …

  5. Vitamin C and Immune Function - PubMed

  6. Vitamin C: Why you need it and how to get enough of it - CNET

  7. The Role of Vitamin C in Human Immunity and Its Treatment …

  8. Myths and truths about vitamin C - Harvard Health

  9. Vitamin C Benefits: Dosage, Sources, and Immune Support Guide

  10. Immune-enhancing role of vitamin C and zinc and effect on …