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Description
It aids in the production of melatonin, the hormone responsible for regulating sleep patterns

References Pickart, L

This can happen as the result of a problem known as functional vitamin B12 deficiency, where there's a problem with the proteins that help transport vitamin B12 between cells

Also - and I feel quite exasperated with your GP - he should be treating your symptoms (ongoing and some quite worrying), not just looking at your blood results
