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Results Study selection A total of 645 studies were identified through database searches in PubMed, Ovid and The Cochrane Library
Normal enzymes do not exclude elevated SAH, low glutathione or impaired metabolic reserve
In addition, the enteric nervous system (ENS), which is a recognized second brain that can regulate many GI functions independent of CNS action, can also act as an intermediate in relaying gut-derived information to the CNS 25
(5) In this same study, the 50% increase in these levels did not result in adverse effects (excessive levels of GH) due to a protective feedback mechanism
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