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For all the wonderful fat-burning and cardiovascular benefits touted for L-carnitine and the neuro-protective effects of ALC (acety-L-carnitine), there seems to be some evidence that L-carnitine may suppress thyroid function and, in fact, is used for hyPERthyrodisim:
http://www.lef.org/magazine/mag2007/dec2007_report_thyroid_01.htm
from: http://www.mythyroid.com/vitamins.html
What effect does carnitine supplementation have on thyroid function? The data appears to show that L-carnitine can function as an antagonist of thyroid hormone, likely by blocking the entry of thyroid hormone into cells. Indeed, these properties of L-carnitine may be beneficial in hyperthyroid subjects. As hyperthyroidism may be associated with modest carnitine deficiency, the effects of carnitine supplementation were examined in a small randomized trial of women on L-thyroxine supplementation. Modestly beneficial effects of carnitine were seen in this study, as described in Usefulness of l-carnitine, a naturally occurring peripheral antagonist of thyroid hormone action, in iatrogenic hyperthyroidism: a randomized, double-blind, placebo-controlled clinical trial. J Clin Endocrinol Metab. 2001 Aug;86(8):3579-94.
Anyone care to add further to this?
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