Researchers have discovered echinacea increases T cells, and interferon which fight against viruses. Echinacea is to be taken at the onset of illness, and should be discontinued once healing is noticed. Golden Seal is a natural antibiotic, and is not to be used indefinitely. In addition, pregnant women should no take this herb as it can stimulate uterine contractions. People with hypertension should avoid golden seal as it can trigger contraction of vessels.
Cayenne is used to maintain mucus flow, which prevents congestion.
Fenugreek breaks up the phlegm, while slippery elm removes it from the body. Steam inhalation is beneficial when dealing with congestion. This is accomplished by breathing in steam from under a tent. A simple version of that is pouring boiling water over herbs such as sage or eucalyptus into a bowl, and placing a towel over ones head while carefully breathing in the steam. This technique is beneficial in breaking up congestion.