vitamin b12 injection action Injections: Benefits and Risks Cyanocobalamin Injection - Cleveland Care

One of the primary mechanisms postulated to underlie the neurodegenerative effects of CCL11 in long COVID involves the induction of hippocampal microgliosis, leading to diminished neurogenesis and the deterioration of myelinated subcortical axons 27

Injection depth: Medication injected into muscle absorbs faster than subcutaneous medication

Only when B12 injections became available was folate treatment abandoned, leaving many victims with irreversible B12-deficiency-related neurological damage

Oral B12 supplements require daily intake and have much lower bioavailability only about 1 to 2% is absorbed without intrinsic factor.

Please reference the following link to learn more

Evidence shows that your small intestine can produce some intrinsic factors following a gastrectomy