[8] The age-related decline and its implications The decline of circulating GHK from 200 ng/mL at age 20 to 80 ng/mL by age 60 correlates with reduced wound healing capacity, thinner skin, decreased collagen density, and slower tissue repair
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Limitations of animal research: Rat healing faster than human, young research animals heal better than aged humans, controlled injury models don't replicate complex human injuries perfectly, dosing conversions uncertain (body weight scaling imperfect), immune system differences affect inflammation and healing
doi:10.2337/dbi20-0040 Tyson CC, Nwankwo C, Lin PH, Svetkey LP
The joints of people who do not move enough or those who are bed ridden for long also suffer as the cartilage tissue does not feed and is thus damaged