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The Chinese yam has the effect of strengthening the spleen and tonifying the lungs, benefiting the stomach and tonifying the kidneys, fixing the kidneys and benefiting the vital essence, brightening the ears and eyes, strengthening the tendons and bones, and prolonging the life. When the body has a loss of appetite, weak spleen and stomach, tiredness and fatigue, weak lung qi, coughing and wheezing, kidney qi deficiency, impotence of the lower limbs, thirst and frequent urination, spermatorrhea, premature ejaculation, white turbidity under the belt, obesity, swelling of the skin, and other diseases, it has a good therapeutic effect. In addition to the body also has antibacterial and anti-thyroid effect, rich in phytochemical alkaloids, can also cause allergic symptoms to the skin, so when taking yam, there is a close observation of the body's role. Also has astringent, for the body to appear constipation as well as intestinal diseases patients avoid taking.

Nutritional value

Waiyao yam is mainly composed of starch 16% (amylase), protein (which sugar protein including 16 kinds of amino acids), sugar (mannose, glucose, galactose), saponin mucus, vitamins, iron and manganese and a variety of trace elements and a variety of other ingredients, there is a strip of dry and straight, the color of the white, powdery and other characteristics.

Iron yam is produced in Wenxian yam varieties, belonging to the Huai yam in the "superb", rhizome is cylindrical, 60-80 cm long, the longest up to 100 cm or more, body fine and firm, less water, juice is thicker, flavorful, and the mouth! "face and sweet", and accompanied by a faint hemp flavor. The main ingredients are saponin, mucilage, choline, yam alkaloids, starch, glycoprotein, free amino acids, polyphenol oxidase, vitamin C, iodine, 16 kinds of amino acids, as well as iron, copper, zinc, manganese, calcium, and many other trace elements, has the spleen, tonifying the lungs, fixing the kidneys, suitable for the brain, wisdom, nourishing the face, anti-aging, anti-tumor, anti-fatigue, anti-harmful substances stimulation, regulation of metabolism, enhance immune function, promote growth, Regulate endocrine, regulate kidney function, excite the blood system, regulate the function of the nervous system, is the highest medicinal value of yam, the best tonic effect of the species. Regular consumption, not only can enhance physical fitness, nourish the skin, delay aging, and on the kidney deficiency lumbago, dysmenorrhea, kidney deficiency, lack of appetite, less food sugar, spleen deficiency and diarrhea, lung deficiency cough, obesity, etc. quite effective.

Medicinal value

Wai yam taste sweet, flat, to the spleen, lungs, kidney meridian, the Department of an important tonic drugs, with nourishing kidney, stomach, phlegm, tonifying the middle and beneficial to the qi, dispel cold winds, suppressing the heart and spirit, soul, and long marrow and other efficacy. Clinically used in spleen deficiency, less food, diarrhea, lung deficiency, cough, spermatorrhea, spermatorrhea, urinary frequency, thirst, neurasthenia and other diseases. Raw yam is commonly used in frostbite, phlegm asthma, urinary frequency, etc., is one of the commonly used Chinese medicine prescription tonic. Processed yam is called light yam. Light yam should be soaked before entering the medicine, that is, soak 3-4 into the water, fish out and moisten, sunshine to forty percent dry, smothered and moistened to the inside and outside of the uniform, sliced, sun-dried can be used in medicine.