does b12 injections work How Quickly Does a B12
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The other option would be to take a supplement, which would take many hours in the digestive process and would lose much value along the way

undertook an open label RCT in which a monotherapy of 2000 g twice weekly B12 IM ( n = 50) was compared to daily administration of 10 mg oral nortriptyline ( n = 50)

biology, methyl donor availability, and intracellular signaling processes

J.ImaiS

doi: 10.1126/scitranslmed.aab2009

Thats why timely diagnosis and treatment are essential
