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Frontiers | The Long History of Vitamin C: From Prevention of the Common Cold to Potential Aid in the Treatment of COVID-19
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HRI ColdCare Immunity 30 Tablets - Echinacea, Plus Vitamin C and Zinc to Relieve The Symptoms of Colds and Flu Type Infections. 1 Pack : Amazon.co.uk: Health & Personal Care
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Effect of vitamin C on common cold: randomized controlled trial | European Journal of Clinical Nutrition
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