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Thijs et al., 2019

GHK-Cu has more skin research

Taken together, these data point to a disruption of the intestinal epithelial barrier function early in the course of RA development

Despite being quadrupedal for locomotion, cynomolgus monkeys also spend large amounts of time in semierect and erect positions and exhibit characteristics that more closely mimic humans, including IVD size, anatomy, spontaneous disc degeneration, and exposure to mechanical stresses compatible with erect posture

PlexusDx recommends storing reconstituted semaglutide in the refrigerator at 36-46F (2-8C) for a maximum of 28 days from the date of reconstitution

As Marre says if the fluid was cold then it would sting a lot as well - they tend to store ampoules in the fridge so they are way off body temperature unless they are warmed in the hands first