Haha, Immunity booster is a business stunt only. There is nothing in this world which causes boosting of immunity. Nowadays everyone is selling their own product in the name of immunity booster. Pls stay away from these things. Boosting of immunity leads to multiple autoimmune diseases. In fact many drugs which are used in treatment of severe ( seriously ill) COVID19 patients (, for example tocilizumab, dexamethasone ) , they act by decreasing immune response. Some products ( natural , herbs ) are antiviral in nature but not having immune booster properties. Believe ins science, not unseen or untested products. Stay fit and active by balanced diet , regular exercise, leaving addictions and avoiding eating unhealthy products. Hope this will let u think so much!!!!

Multivitamins , multiminerals. Fresh vegetables Fruits Meat Egg Milk Plenty of water Proper sleep Physical exercise

You can take a capsule b complex for next 7 days. Drink plenty of water. If you've got baseline investigations,  you can take supplements, else you can consulme curd/animal meat/milk to complete the nutritional requirements. For home temedies, consult online please.