Hello friends , does anyone know anything about Sage Tea helping people to get better from colds, flu, bronchitis, sore throats etc , please let me know if anyone has heard of Sage Tea ?

My landlord was over Germany and the pharmacy recommended that the landlord try Sage Tea to get better and he claims that it does justice for him but just wondering where to buy Sage Tea , he said, you get the Sage and boil it down into a liquid than it goes into a tea I'm looking something to take for my immune system since i believe my immune system was down this month of February as you all are aware that i been sick this whole month with pneumonia and than later sick with Acute Sinus Infection , Thank you