With Metformin I experienced Brain Fog, I haven't had brain fog since I started taking KSM-66 (Ashwagadha). Therefore in my mind, Metformin increases the risk of Dementia as the study "Metformin Use Linked to Increased Dementia, Parkinson's Risk in Patients With Diabetes" declared and is valid..... even for those that don't have diabetes... medscape.com/viewarticle/87...
Posted as a follow-up to: healthunlocked.com/cure-par...
COVID survivors may be at a greater risk of developing Parkinson’s–like symptoms, researchers warn. What to know to protect your health
Metformin for Parkinson’s? 
Is Parkinson's Disease brain fog a precursor to dementia? 
Is this study on the Chinese herb jujube for Parkinson's et al common knowledge?
