Natural Immune Booster Market, By Product Type (Herbal Supplements, Vitamins and Minerals, Probiotics, Functional Foods and Beverages, Essential Oils), By Application (Immune System Support, Cold and Flu Relief, Allergy Management, Respiratory Health, Digestive Health, Others), By Distribution Channel (Health Food Stores, Online Retailers, Pharmacies and Drug Stores, Supermarkets and Hypermarkets, Others), By Geography (North America, Latin America, Europe, Middle East & Africa, and Asia Pacific)