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Warning Signs of Improper Dosing TTaking too little B12 may leave deficiency-related nerve symptoms untreated, while improper use can also lead to unwanted effects or missed diagnoses

Neurological changes A lack of vitamin B12 can cause neurological problems, which affect your nervous system, such as: vision problems memory loss pins and needles loss of physical co-ordination (ataxia), which can affect your whole body and cause difficulty speaking or walking damage to parts of the nervous system (peripheral neuropathy), particularly in the legs If neurological problems do develop, they can sometimes be irreversible

But what is the role of B12 for your eyes

Light scattering and the molecular weight of the proteins