Answer:Guggul, a tree resin commonly used in Ayurvedic medicine to treat a variety of conditions, is sometimes also promoted to enhance thyroid function. However, there is little evidence to support this use. In fact, the suggestion appears to be based a single animal study which found guggul increased iodine uptake and certain other measures of thyroid function in rats with chemically-induced low thyroid function (Tripathi, Planta Med 1988). There do not appear to be any randomized, placebo-controlled, peer-reviewed studies in people. (Interestingly, in a small study among adults who took 2,160 mg of guggul daily for three months, two people reported tiredness and "relapse" of their hypothyroidism (Nohr, Complement Ther Med 2009)).
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