how fast does b12 injection work Do Injections Work? Results Timeline How Long Does It Take

doi: 10.1186/1472-6793-7-2 61 Duran-OrtizSListEOBasuRKopchickJJ

Inadequate secretion of intrinsic factor, resulting from lesions that destroy the gastric mucosa (which can be caused by ingestion of corrosives, extensive tumors, and conditions associated with gastric atrophy, such as multiple sclerosis, certain endocrine disorders, iron deficiency, and subtotal gastrectomy) Structural lesions leading to vitamin B 12 deficiency, including regional ileitis, ileal reactions, and malignancies Competition for vitamin B 12 by intestinal parasites or bacteria

Or you can give him the Zobaline instead

It plays a significant role in cellular processes such as metabolism, DNA repair, and chromatin remodeling, which are vital for maintaining tissue and metabolic homeostasis