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Animal proteinsmeat, poultry, fish, eggsare the sources of Vitamin B12 for humans

METHYLCOBALAMIN PROMOTES THE DIFFERENTIATION OF SCHWANN CELLS AND REMYELINATION IN LYSOPHOSPHATIDYLCHOLINE-INDUCED DEMYELINATION OF THE RAT SCIATIC NERVE Human studies are ongoing, and it might take a few more years to derive conclusive evidence applicable to human physiology

Molecular mechanisms of androgenetic alopecia

Older individuals can still see excellent results, but it may take longer and require more cycles

Symptoms of a deficiency can include extreme tiredness, lack of energy, breathlessness, feeling faint, pale skin, heart palpitations and headaches

The honest answer is that the evidence cannot say, because no study has ever compared them directly in the same model, let alone in humans