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A straight laser Doppler probe (outer diameter: 0.9 mm) was directed to the papilla between the two upper incisal teeth using manipulator fixation

Fourth, well-designed human trials in a specific, measurable indication (rather than broad anti-aging framing) would be needed before any efficacy claim could be made

Antioxidant and Oxidative Stress Pathways A recurring theme across Epitalon cellular aging studies is the peptides proposed interaction with cellular antioxidant defence systems, a pathway also explored through the GHK-Cu Peptide , for research including: Superoxide dismutase (SOD) activity Catalase and glutathione peroxidase expression Reduction of lipid peroxidation markers in laboratory models These pathways are relevant because oxidative stress accumulation is considered a fundamental contributor to cellular ageing across multiple experimental models

Increased oxidative stress suggested by low serum vitamin e concentrations in patients with chronic fatigue syndrome