The FDA is said to have of late instituted a crack down on weight loss supplements as a result of really serious negative effects and even death connected with some dietary supplements like ephedra. The ban on ephedra goods resulted to the development of so-called ephedra free weight loss supplements, these too have been shown to yield their own fair share of conditions and they too could possibly be meant to exactly the same fate as ephedra.

These ephedra free medicines are said to result in a rise in heart rate and a couple other unintended effects on healthy folks as outlined by a health authority who took part in the research project.

The inquiry carried out by the University of California at Berkeley was the first one to go into the health effects of reformulated weight loss supplements. On the list of things investigated for included high blood pressure and heartbeat rate of volunteers who were given reformulated weight loss supplements made out of extracts of bitter orange.

Ever since the ban slapped on ephedra by FDA, an increasing number of unwanted weight loss product manufactures have changed to extracts of bitter orange. The USB investigation engaged 20 healthy volunteers, who ingested sole doses of a weight loss supplement or a placebo.

The diet supplements screened in the research were Xenadrine EFX and Advantra Z, each of which contains bitter orange extracts. The administered drug was shown to produce a slight increase in cardiovascular pulse rate as high as 16 beats in one minute. The Thermogenic Xenadrine EFX especially was shown to rev up heartbeat by 13 per cent, something which makes it almost identical in performance to ephedra.

Bitter orange extracts contain synephrine, a component specific to over 90% of citrus fruits but found in increased concentrations in fruits such as Sour orange, Zhi shi and bitter orange and which can be commonly used as a relief medication in the control of respiratory tract congestion and high blood pressure. Xenadrine EFX features a stimulant in the ingredient, usually caffeine. The quantity of caffeine is Xenadrine is thought to be roughly the same as 3 coffee cups. This is the element the cause the boost in blood pressure and people using this product are informed against over dosage.

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Since the ban slapped on ephedra by FDA, an increasing number of weight loss product manufactures have turned to extracts of bitter lemon. The USB study involved 20 healthy volunteers, who were given single doses of a weight loss supplement or a placebo.

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