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Description
Someone once described it to me as the nerves starting to wake up after being starved of B12 for so long

However, systemic effects from distant-site injection are also documented, and for diffuse neuropathies affecting multiple nerve territories, systemic administration may provide more uniform coverage

Just treating one aspect often isn't enough

An Updated Review of the Literature. Frontiers in Physiology

Even meat-eaters can experience deficiency due to poor absorption, which often relies on a stomach-produced protein called intrinsic factor
