Pennyroyal
herbal supplementation
"As a kid, when I got a cold, sore throat or flu, the first treatment was almost always "mountain tea", or Pennyroyal.  My Mother's Grandmother or my Father picked some every year on the mountain north of our home.  The tea relieved congestion and was always soothing.  It also made you pee a lot!
I learned to find, pick and dry it; so my kids also got the same treatment.  I'm 75 and still have dried Pennyroyal on the shelf.
This is potent.  Don't overdo it.  3 or 4 cups a day for the first two or three days of a cold is all you need.  I use about 3/4 of a teaspoon to a cup of almost boiling water; steep 4 - 5 minutes and strain."