Proc Natl Acad Sci U S A 95(13):78057812 Reed MC, Nijhout HF, Neuhouser ML, Gregory JF, Shane B, James SJ, Boynton A, Ulrich CM (2006) A mathematical model gives insights into nutritional and genetic aspects of folate-mediated one-carbon metabolism
GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a tripeptide naturally present in human blood plasma at concentrations averaging 200 ng/mL at age 20, declining to approximately 80 ng/mL by age 60
Systemic Effects Common systemic symptoms include nausea, headaches, dizziness, fatigue, drowsiness, decreased appetite, cough, sore throat, and flu-like signs
10.1016/j.vetimm.2019.109892 30 FlippinM
Circu and Aw, 2012