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Formation of oxygen radicals in biological systems There are many and various types of free radicals in biological systems, however, those derived from oxygen, generally termed reactive oxygen species (ROS) are of major concern and interest to researchers in the field of free radical chemistry
To increase glutathione levels in cells for therapeutic and other purposes, precursors (such as N-acetyl cysteine) and analogues of glutathione have been employed, since glutathione itself is not efficiently transported across the mammalian plasma membrane (12)
Cross sectional studies done to assess the association between body composition and stimulated GH release in healthy subjects show that, adult people (mean age 50 yr) have a lower peak GH response to secretagogues (clonidine and arginine), and females had a higher response to arginine when compared to males
Finally, the absence of validated biomarkers for predicting treatment response or monitoring efficacy further complicates both clinical research and practical application, limiting the ability to personalize therapy or objectively assess outcomes
