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thyroid booster (Thyrin-ATC, Thyrox T-3, Thyrotril, Thyrostart)
Generally contain guggul extracts & L-tyrosine
Some products contain iodine from kelp, laminaria or bladderwrack.
No proof that these products increase metabolism or facilitate weight loss.
General
weight loss supplement
References
Prescriber's Letter 13(2): 2006
Detail-Document#: 220209
(subscription needed) http://www.prescribersletter.com