Ephedra accelerates Conversion of T4 to T3

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Ephedra has a threefold effect for the weight lifter. 1) It stimulates the

release of noradrenaline, which indirectly stimulates beta-receptors. The

beta-receptors are important in regulating lipolysis, the breakdown of fat.

2) It accelerates conversion of the inactive thyroid hormone T4 into the

active form T3. The active form makes the body more sensitive to the

hormones noradrenaline and adrenaline, increasing the body’s metabolism and

burning more calories. And 3) it inhibits catabolism, the breakdown of

muscle

http://www.vitaconnect.com/Articles/ECA.asp

Thyroid-Adrenal Connection: Information and Resources

http://www.bestweb.net/~om/thyroid