Plants contain a unique blend of chemicals, many of which have a beneficial, medicinal action. In fact, over a third of medically prescribed Western drugs are based on traditional plant remedies, such as aspirin (derived from the willow tree), morphine (opium poppy), digoxin (foxglove), sodium cromoglycate (an asthma drug derived from the middle eastern herb, Ammi visnaga) and powerful anti-cancer treatments such as vincristine (from the rosy periwinkle) and paclitaxel (from the Pacific Yew Tree).
Unlike prescribed drugs, which tend to contain a single, isolated, active ingredient, herbal medicines supply a blend of natural constituents that have evolved together and often have a synergistic action. They also tend to be more gentle, with less risk of side effects than prescribed drugs, although this is not always the case.
Different parts of different plants are used, such as the roots, stems, flowers, leaves, bark, sap, fruit or seeds depending on which has the highest concentration of active ingredients. Harvested plants are usually dried and ground to produce a powder from which may be made into an aqueous infusion (tea or tisane), an alcoholic solution (tincture) or packed as raw powder into tablets/capsules. Modern technology now allows extraction of the active ingredients using a solvent, which is then removed to produce more concentrated remedies. These residual solids are then dried and powdered to make tablets or capsules.
The concentration of active ingredient found in each plant varies depending on its genetic strain, soil mineral content, the time of harvesting, and the methods of cultivation used. As the potency of different batches of herb varies significantly, I recommend only using a standardised preparation in which there is a known, consistent amount of active ingredients. This ensures that each dose provides the same benefit. Standardised remedies are also more likely to have clinical trials supporting their use.
Traditional Herbal Medicines
In the UK, a number of traditional herbal remedies are now classed as medicines under the traditional herbal registration (THR) scheme. These are used to relieve or prevent symptoms of common minor ailments, including coughs & colds (Pelargonium, Echinacea), stress (Rhodiola), low mood (St John’s Wort), digestive disorders (Milk Thistle), muscle or joint pains (Devil’s Claw), menopause (Black Cohosh), migraine (Feverfew), premenstrual syndrome (Agnus Castus), prostate enlargement (Saw Palmetto) and sleep disturbances (Valerian).
During the complex registration process, these traditional herbal medicines undergo extensive quality testing to ensure they are as safe and appropriate to use as other over-the-counter medicines. Information on the front of each pack clearly explains which minor ailments can be treated by each herbal medicine, based on traditional use. A Patient Information Leaflet inside each pack tells you when and how to take the herbal medicine and the recommended dosage. Important safety information is also included, such as potential side effects and known interactions with prescription drugs.
NB Do not take any herbal remedies during pregnancy or when breast-feeding unless specifically advised to by a medical herbalist or doctor.
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