Some effective herbal medicines include garlic, ginger and echinacea, according to the University of New Hampshire. Additional effective herbal medicines include St. John's wort, lavender and chamomile, claims HowStuffWorks.
Advocates of echinacea use it to reduce cold and influenza symptoms, and for kidney infections, according to the University of New Hampshire. People take garlic to reduce cholesterol levels and blood pressure. Ginger reportedly helps with nausea, while gingko is known to improve memory and circulation to the brain, and to regulate irregular heartbeats.
Ginseng is used to boost the immune system, reduce blood pressure and decrease fatigue, states the University of New Hampshire. St. John's Wart acts as an antidepressant, and helps with treating anxiety and burns. People use lavender is for stress relief, and chamomile for anxiety and insomnia.