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This process elevates circulating growth hormone levels, which in turn stimulate the production of IGF-1, a hormone that supports tissue growth and repair

CNS Drugs 2009, 23, 3558

In a hydrogel carrying drug-linker conjugates according to the invention, a backbone moiety is characterized by a number of hydrogel-connected drug-linker conjugates

doi: 10.1016/s1388-1981(02)00296-2

There is an even more promising study from 1998 that was done on people and compared vitamin C, tretinoin, and copper-tripeptide

Such modifications can result in loss of enzymatic activity, altered cellular signaling, and degradation of structural proteins, contributing to cellular dysfunction and death [36, 37]