Quoted from The Hundred-Year Lie:
At London’s Kew Gardens’ Jodrell Laboratory a group of scientists began a series of molecular tests and clinical trials during the summer of 2005, examining the herbal cures described in a famous text called Herbal, written in 1628 but based on hundreds of years of folk-healing wisdom preceding the seventeenth century. The first plant they analyzed was figwort, identified in the ancient text as containing a substance that “dissolves clotted and congealed blood within the body,” and was traditionally used to heal wounds. The scientists discovered that figwort did indeed initiate a healing process in cell cultures they subjected to analysis.
Next they looked at sage, an herb that has been connected with wisdom down through the ages, and in collaboration with researchers at King’s College London, found that sage does affect receptors in the brain. People who took sage oil showed a marked improvement in their memory.
Cherokee medicine, for example, with its theme of mixing medicine from nature’s gifts, uses dozens of herbs with established health benefits. Alfalfa, which is rich in six vitamins and calcium, has been a traditional immune system booster. Marigold flowers have been a longtime cure-all because of their antimicrobial, anti-fungal, and antibacterial properties.
Fitzgerald, Randall (2006-06-22). The Hundred-Year Lie: How to Protect Yourself from the Chemicals That Are Destroying Your Health (p. 212-13). Plume. Kindle Edition.