Doppelherz Immune plus - With vitamin C, vitamin D and zinc as a contribution to the normal functioning of the immune system - 120 tablets : Amazon.de: Health & Personal Care
Abtei Vitamin C 600 Forte Plus Zink, Vitamin D3 Tabletten, 42 er | bie-dro
Nutritional risk of vitamin D, vitamin C, zinc, and selenium deficiency on risk and clinical outcomes of COVID-19: A narrative review - Clinical Nutrition ESPEN