When tissue is damaged by injury, inflammation or oxidative stress extracellular matrix proteins (notably collagen and SPARC) are broken down, releasing peptide fragments including GHK

References The Lancet (2021) Onceweekly cagrilintide for weight management: phase 2 dosefinding trial (Lau et al.) Int J Mol Sci (2024) Amylin, another important neuroendocrine hormone for treatment of diabesity PMC (2022) Mediators of amylin action in metabolic control The Lancet (2021) Cagrilintide phase 2 trial: 10.8% weight loss at 4.5 mg dose over 26 weeks N Engl J Med (2025) REDEFINE 1: Coadministered cagrilintide and semaglutide in adults with overweight or obesity The Lancet (2021) Cagrilintide + semaglutide phase 1b trial: safety, tolerability, pharmacokinetics (Enebo et al.) J Med Chem (2021) Development of cagrilintide: a longacting amylin analogue Brain Res Rev (2005) Pancreatic amylin as a centrally acting satiating hormone PMC (2006) Pancreatic signals controlling food intake: insulin, glucagon, and amylin PMC (2016) Amylinmediated control of glycemia, energy balance, and cognition PMC (2024) Clinical pharmacokinetics of semaglutide: systematic review (includes cagrilintide PK data) N Engl J Med (2025) REDEFINE 2: Cagrilintidesemaglutide in adults with overweight/obesity and type 2 diabetes CDC Vaccine administration: subcutaneous injection technique and site guidance CDC (PDF) You Call the Shots: subcutaneous injection diagram and best practices Additional Research and Background These sources provide related context and are not presented as support for a specific statement above

Finally, TRANSCEND-T2D-3 (NCT06297603) will compare retatrutide to placebo over 14 months, in people with inadequately controlled T2D and moderate-or-severe renal impairment on basal insulin
You may find that like me, they are a different to normal for a while
High doses of B12 may worsen the disease and cause irreversible damage to the optic nerve