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Endogenous (naturally produced) HGH surges during sleep and intense physical activity, but levels begin to decline significantly with age

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Adv Sci 11:2305913 Hu D, Li X, Li J et al (2023) The preclinical and clinical progress of cell sheet engineering in regenerative medicine

Despite finding no association between serotonin, tryptophan, aspartate, and kynurenine plasma levels with these symptoms, interestingly, we observed a subtle inverse correlation between sarcosine concentrations and both cognitive failure function scores ( Figure 7A ) and depression scores in LC patients ( Figure 7B )

lower grades may compromise efficacy