You do get B12 in foods such as red meat, poultry, fish, and eggs
Baltaci, Davut, et al
But, a doctor should decide the best one for you
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B-12 injections can support cognitive health by promoting nerve cell protection and efficient neurotransmitter signaling
The most chemically complex of all the vitamins, methylcobalamin is a water-soluble, organometallic compound with a trivalent cobalt ion bound inside a corrin ring which, although similar to the porphyrin ring found in heme, chlorophyll, and cytochrome, has two of the pyrrole rings directly bonded