b12 injection side effects headache The Weird Connection Between Deficiency & Migraine Headaches Why do I feel worse

Then your first step should be injecting daily for at least 90 days straight

Plant foods are not a natural source of vitamin B12, however, fortified yeasts and breakfast cereals are available as a non-animal source

Precision diagnosis and treatment of vitamin metabolism-related epilepsy

Vitamin B12 can then be absorbed into the bloodstream via endocytosis in the distal ileum, or by passive diffusion in the absence of intrinsic factor.2 Pernicious anemia (an autoimmune disease) affects the gastric mucosa, leading to destruction of parietal cells and failure to produce intrinsic factor, resulting in vitamin B12 malabsorption and eventually deficiency