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These two cover the majority of the human bodys B12 needs

doi: 10.1016/j.biomaterials.2016.04.013

The surefire way of doing that is by injecting into the muscle. 2

Bengra C, Mifflin TE, Khripin Y, Manunta P, Williams SM, Jose PA, et al

If detected early, when it manifests as tingling sensations, it is reversible