An Adaptogen
Ashwagandha is not an appetite suppressant based on the current understanding of its pharmacological effects. However, this ancient Ayurvedic herb is traditionally viewed as an "adaptogen," meaning that it can help to minimize stress-related fluctuations in the diet. Herbalists view adaptogens like ashwagandha, rhodiola and ginseng as ideal for people who overeat or undereat as a result of environmental stresses. Ashwagandha may also help to raise metabolism and eliminate irregularities in digestion.
The Science
As of August 2009, there have been no peer-reviewed trials regarding ashwagandha's effectiveness as an appetite suppressant or metabolism booster--its effectiveness has been neither been proven nor disproven. However, a 2000 review showed that numerous clinical studies have confirmed ashwagandha's adaptogen properties, which are especially powerful when it is used in synergistic combination with similar herbs. Since ashwagandha itself contains no stimulants, it can be a safe addition to supplements such as green tea that stimulate weight loss.
Safety
Extensive animal tests have failed to demonstrate any significant side effects associated with ashwagandha, even when it is used in large doses. A clinical review published in 1998 demonstrated no toxic effects in rats given extremely large doses of ashwagandha and ginseng. The review also noted that "both [herbs] individually have not shown any toxicity on long term administration." However, ashwagandha should be used with caution by people with medical conditions and women who are pregnant.
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