I have extreme post nasal drip after COVID, kept me up at night as any movement would trigger drainage, a tickle in my throat and then coughing, blowing my nose all night long. After discussing with my chiropractor, they recommended I try the Standard Process brand Antronex, it is a liver health supplement as when the liver is having trouble(I didn't have any blood tests that revealed my liver was having trouble except my Alkaline Phosphatase was low). you will have sinus issues. I took 3 in the morning and 3 at night until my symptoms got a lot better (about a month for me). Now I just take 2 mid day.