Self-Care for Common Colds: The Pivotal Role of Vitamin D, Vitamin C, Zinc, and<i> Echinacea</i> in Three Main Immune Interactive Clusters (Physical Barriers, Innate and Adaptive Immunity) Involved during an Episode of Common Colds—Practical Advice on Dosages and on the Time to Take These Nutrients/Botanicals in order to Prevent or Treat Common Colds
Evidence-based complementary and alternative medicine