can you use ghk cu with retinol and What if could reverse your skin's biological age? The research points “Is GHK-Cu actually worth it?”

Therapeutic Medicine 20 (2), 10031011

2.3 Diagnosis and management Peripheral fatigue can be quantified through objective assessments of strength and aerobic capacity, while central fatigue is evaluated using self-reports and validated questionnaires that capture the patients perception of physical and mental exertion impacts on their activities and exertion levels

Mitochondria in innate immune signaling

But here is the critical caveat

BAs exert regulatory effects on BAs homeostasis, glucose metabolism, and insulin sensitivity through activation of specific receptors, such as the farnesoid X receptor (FXR) and G protein-coupled receptors (64)