 Not many people have heard of it, and that's called ivy leaf, IVY, just like the English ivy. The young tender leaves are extracted and put into syrups. This is absolutely the best mucus buster anywhere. And I use it frequently. It's just now starting to come in the United States more. There are plenty of products out there. But what you want is an ivy leaf extract, perhaps with thyme in it as well. And there's a European product.