My sister takes goldenseal for allergies and says that it works. She says that when she takes it at the first signs of a sinus allergy, it helps prevent a sinus infection or speeds up healing. She's very happy with the results.
I took goldenseal a few weeks ago after hearing my sister's experience. I had a tooth infection recently and I thought that the goldenseal might help. I actually think that it was helping, but I couldn't continue to take it because it gave me stomach acidity and nausea. I tried taking goldenseal after meals as well but the result was the same. I think this supplement causes upset stomach in some people.