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There is little modern clinical research on Dioscorea villosa, and the one study of a wild yam-containing cream for menopausal symptoms failed to find any value from this therapy. [18] According to the American Cancer Society, there is no evidence to support wild yam or diosgenin being either safe or effective in humans. [19]
Wild yam (or Chinese yam) – types of yam, the roots of which are made into creams and dietary supplements that are promoted for a variety of medicinal purposes, including cancer prevention. The American Cancer Society says of these products, "available scientific evidence does not support claims that they are safe or effective."
[8] [irrelevant citation] Wild yams are an important crop, as they have been used to prevent menstrual cramps, stomach cramps, and general pain for centuries. During the 1950s scientists found that the roots of wild yams contained diosgenin which is a plant-based estrogen; diosgenin is hypothesized to aid in chemical defense against herbivores.
Dioscorea alata – also called ube (/ ˈ uː b ɛ,-b eɪ /), ubi, purple yam, or greater yam, among many other names – is a species of yam (a tuber). The tubers are usually a vivid violet - purple to bright lavender in color (hence the common name), but some range in color from cream to plain white.
Pain relief creams work by delivering active ingredients directly to the affected area. These ingredients can create sensations like cooling, warming, or numbing, which distract from pain signals.
The natural, plant-derived progesterone creams sold over the counter contain too little progesterone to be effective. Wild yam ( Dioscorea villosa ) extract creams are not effective since the natural progesterone present in the extract is not bioavailable.
The researchers do warn, however, that the study does not show that a short-term ‘detox’ period is all that is required to ‘refresh’ the liver or achieve other health gains.
In Vietnam, the yam is called củ mài or khoai mài. When this yam is processed to become a medicine, the yam is called hoài sơn or tỳ giải. In the Ilocano of the northern Philippines it is called tuge. In Latin American countries it is known as camote del cerro or white ñame. In Manipuri it is called as "Ha".