During menopause, declining estrogen levels trigger the symptoms that disrupt your life: hot flashes and night sweats, vaginal dryness and discomfort, mood changes and irritability, sleep disturbances, brain fog and memory issues, bone density loss, and changes in skin elasticity and moisture
Hansen MS, Wlfel EM, Jeromdesella S, Mller JK, Ejersted C, Jrgensen NR, et al
Subsequent research revealed that GHK-Cu is a naturally occurring bioactive peptide present in human plasma, saliva, and urine, and its concentration in plasma decreases significantly with agefrom approximately 200 ng/mL at age 20 to less than 80 ng/mL by age 60
doi:10.1016/j.soard.2013.04.017