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GHK-Cu is a naturally occurring copper-binding tripeptide first identified in human plasma in 1973 by Loren Pickart
It is most relevant during GLP-1 use or caloric deficit, when fatigue is part of the picture, or when progress stalls after a clean first month
Whether systemic injection delivers ascorbic acid to the dermis in concentrations that meaningfully exceed what the body achieves through normal dietary intake has not been established in controlled skin-outcome studies
Qian F, Huang J, Hussain MA
The latter (also called "sick headaches") tends to be accompanied by sleepiness, sensitivity to light and/or sounds, nausea, and in 15 to 20 percent of people, aura, he notes
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