Green tea is also a good source of the amino acid L-theanine may aid in the production of germ-fighting compounds in your T-cells.
Take 2 cups daily at least to get maximum benefit.

Ministry of Ayush has also suggested that drinking herbal tea/decoction (Kadha) made from Tulsi (Basil), Dalchini (Cinnamon), Kalimirch (Black pepper), Shunthi (Dry Ginger) and Munakka (Raisin) once or twice a day can help build immune system. Add jaggery (natural sugar) and/ or fresh lemon juice to your taste, if needed.

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