Sipping Tulsi Tea for antioxidants and other nutrients: Colder months are closely associated with lowered immunity which in turn increases your chances of contracting the flu. Tulsi (Holy Basil) enhances your immune system to fight the viruses. It also improves the body’s overall defence mechanism, reduces stress, improves stamina, boosts immunity, fights and prevents chronic disease, and provides a rich supply of antioxidant and other nutrients.