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Although various factors, including chronic hyperglycemic stimuli, repeated episodic hypoglycemia and ketoacidosis, damage to the BBB, insulin dysfunction in the brain, cardiovascular risk factors, and metabolic changes, have been explored, the pathogenesis of diabetes-related cognitive impairment is still a subject of preliminary investigation

That's one of the key takeaways from comparing copper peptides vs vitamin C

The clinical trials on melatonin range in duration from 10 days to 6 months

2022;8(8) doi: 10.1016/j.heliyon.2022.e10012

L-glutathione offers a strong defense against oxidative damage by constantly recycling itself and other antioxidants, promoting general health and reducing the effects of aging