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The hormone of youth and health.


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All About Dioscorea oposita (wild yam):



An Introduction



"Not just another yam."


What is Dioscorea oposita?

Family: Dioscoreaceae
Genus and Species: Dioscorea oposita


Dioscorea oposita, a bean-like perennial climber with long tuberous roots, is commonly called "chinese yam" or "wild yam", and grows mainly in East Asia (China, Korea, and Japan). A number of Dioscorea variants also grow over the world. Flowers of Dioscorea are dioecious (opposite of hermaphrodite), and bloom in September and October. Dioscorea oposita root has been used in Asia for millennia as a tonic herb, and are mainly cultivated in China and Korea for medicinal purposes. Elsewhere in the world, a variety of wild yams have been used as food and herbal medicine to treat rheumatism and arthritis, and also as a cardiotonic. Dioscorea root has saponins, choline, protein, starch, mucilage, fat, sugar, amino acids, amylase (enzyme), phytic acid, mannan, allantoin, vitamin C, beta-carotene, chromium, cobalt, dioscin, dioscorin, diosgenin, iron, magnesium, manganese, niacin, riboflavin, selenium, silicon, thiamin, and zinc, among others. A detailed breakdown of the chemical composition of Dioscorea species can be found in USDA medicinal plant database, Dr. James A. Duke.

-Therapeutic Actions:

Dioscorea oposita is known as a tonic herb that supports spleen, lung, and kidney.
Dioscorea root contains diosgenin, which has anti-fatigue, anti-inflammatory, anti-stress, hypocholesterolemic, and estrogenic effects. Dioscorea is antispasmodic, and could be helpful for nausea of pregnant women (morning sickness), spasmodic hiccough and asthma.
Dioscorea root has been found to contain phytosteroids such as diosgenin and saponin, which are precursors for manufacturing progesterone and other steroid drugs.

Dioscorea oposita is suggested for:

1. chronic fatigue
2. loss of appetite
3. leukorrhea
4. immune deficiency
5. overall weakness and coldness in extremities
6. diarrhea

-Usage:

Dioscorea oposita root is most commonly taken in the form of decoction or tea, or as dry powder supplied in capsules, and in combination with other herbs in many formula.

Dose: Daily intake of up to 9-30 grams of dry root for decoction, or even 250 grams of dry root decoction in case of wasting and thirsting disorders is suggested [Chinese Herbal Medicine, Materia Medica: edited by Dan Bensky and Andrew Gamble, revised edition, 1993].
Side Effects: Possible, but rare adversary effects that have been reported are constipation and elevation of blood pressure.




Dioscorea oposita Research:


Scientific and Clinical Researches


Dioscorea oposita and variants are under clinical research, especially in China, due to its promise as an immune booster herb. Reviews and reports from some of the recent researches on Dioscorea species are provided:

J Agric Food Chem 2001 Oct;49(10):4956-60 - Antioxidant activities of dioscorin, the storage protein of yam (Dioscorea batatas Decne) tuber

Folia Microbiol (Praha) 1996;41(5):407-12 - Antifungal properties of yam (Dioscorea alata) peel extract

Life Sci 1996;59(11):PL147-57 - Antioxidant activity of dioscorea and dehydroepiandrosterone (DHEA) in older humans

Climacteric 2001 Jun;4(2):144-50 - Effects of wild yam extract on menopausal symptoms, lipids and sex hormones in healthy menopausal women

Prikl Biokhim Mikrobiol 1995 Mar-Apr;31(2):238-42 - Composition and biological activity of steroid glycosides from a suspended culture of Dioscorea deltoidea Wall cells

Plant Foods Hum Nutr 1994 Jul;46(1):33-9 - Nutritional assessment of yam (Dioscorea alata) tubers

Planta Med 1990 Jun;56(3):264-7 - Hypoglycaemic activity of dioscoretine from tubers of Dioscorea dumetorum in normal and alloxan diabetic rabbits

J Ethnopharmacol 1986 Feb;15(2):133-44 - Pharmacological evaluation of Dioscorea dumetorum tuber used in traditional antidiabetic therapy



Dioscorea oposita Links


Rain-tree.com: Database - Dioscorea opositae (Wild yam)

Plants for a Future: Dabatase - Dioscorea japonica (oposita) facts

Botany.com - Dioscorea

Findarticles.com - Chinese yam

AltNature.com - Wild yam: Facts and Photos




    The information provided at DreamPharm.com is for educational purposes only and is not intended for self-diagnosis nor self-treatment of conditions that should be managed by a qualified health care provider. Unless otherwise indicated, research, ailment and product information have not been evaluated by the US Food and Drug Administration ("FDA").

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