Herbalism is a traditional medicinal or folk medicine practice based on the use of plants and plant extracts. Herbalism is also known as botanical medicine, medical herbalism, herbal medicine, herbology, and phytotherapy. Sometimes the scope of herbal medicine is extended to include fungi and bee products, as well as minerals, shells and certain animal parts.

Many plants synthesize substances that are useful to the maintenance of health in humans and other animals. These include aromatic substances, most of which are phenols or their oxygen-substituted derivatives such as tannins. Many are secondary metabolites, of which at least 12,000 have been isolated — a number estimated to be less than 10% of the total. In many cases, these substances (particularly the alkaloids) serve as plant defense mechanisms against predation by microorganisms, insects, and herbivores. Many of the herbs and spices used by humans to season food yield useful medicinal compounds.

All plants produce chemical compounds as part of their normal metabolic activities. These include primary metabolites, such as sugars and fats, found in all plants, and secondary metabolites found in a smaller range of plants, some useful ones found only in a particular genus or species. Pigments harvest light, protect the organism from radiation and display colors to attract pollinators. Many common weeds have medicinal properties.

The functions of secondary metabolites are varied. For example, some secondary metabolites are toxins used to deter predation, and others are pheromones used to attract insects for pollination. Phytoalexins protect against bacterial and fungal attacks. Allelochemicals inhibit rival plants that are competing for soil and light.

Plants upregulate and downregulate their biochemical paths in response to the local mix of herbivores, pollinators and microorganisms.The chemical profile of a single plant may vary over time as it reacts to changing conditions. It is the secondary metabolites and pigments that can have therapeutic actions in humans and which can be refined to produce drugs.

Plants synthesize a bewildering variety of phytochemicals but most are derivatives of a few biochemical motifs.

Wednesday 28 May 2008

Bilberry



Introduction

This fact sheet provides basic information about bilberry—common names, uses, potential side effects, and resources for more information. Bilberry is a relative of the blueberry, and its fruit is commonly used to make pies and jams. It has been used for nearly 1,000 years in traditional European medicine. Bilberry grows in North America, Europe, and northern Asia.

Common Names—bilberry, European blueberry, whortleberry, huckleberry
Latin Names—Vaccinium myrtillus

What It Is Used For
  • Historically, bilberry fruit was used to treat diarrhea, scurvy, and other conditions.
  • Today, the fruit is used to treat diarrhea, menstrual cramps, eye problems, varicose veins, venous insufficiency (a condition in which the veins do not efficiently return blood from the legs to the heart), and other circulatory problems.
  • Bilberry leaf is used for entirely different conditions, including diabetes.


How It Is Used
The fruit of the bilberry plant can be eaten or made into extracts. Similarly, the leaves of the bilberry plant can be made into extracts or used to make teas.

Side Effects and Cautions
  • Bilberry fruit is considered safe. However, high doses of bilberry leaf or leaf extract are considered unsafe due to possible toxic side effects.
  • Tell your health care providers about any complementary and alternative practices you use. Give them a full picture of what you do to manage your health. This will help ensure coordinated and safe care.


Sources
* Bilberry. Natural Medicines Comprehensive Database Web site. Accessed July 2, 2007.
* Bilberry (Vaccinium myrtillus). Natural Standard Database Web site. Accessed June 28, 2007.
* Bilberry fruit. In: Blumenthal M, Goldberg A, Brinckman J, eds. Herbal Medicine: Expanded Commission E Monographs. Newton, MA: Lippincott Williams & Wilkins; 2000:16–21.

Posted by AGID at 09:00

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