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Causal relationship between circulating insulin-like growth factor-1 and Parkinsons disease: a two-sample Mendelian randomization study

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However, as research continued, experts found that GHK could modulate a number of different cells besides those in the liver.4 GHK is naturally found in human saliva, plasma, and urine, but its standard levels are reduced by over half once you reach age 60

10.1186/s40168-020-00955-1 Microbiome 81 JarretA.JacksonR.DuizerC.HealyM

Thus, a larger-scale multi-center study will be considered in the future to minimize the potential interference of these factors