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Vitamin B12 is a water-soluble vitamin that plays an essential role in many bodily functions, including the metabolism of carbohydrates, fats, and proteins

I've not come across the negative side effects you list

It is essential for the production of myelin, a protective layer around nerves that helps transmit signals efficiently in the brain

Procaine Procaine may support efforts to stem or reverse age-related dementia, memory decline, and cognitive function

Research published in peer-reviewed journals has explored B12-conjugated GLP-1 agonists specifically to test whether B12 attachment reduces central nervous system penetration while preserving peripheral metabolic effects