lump on arm after b12 injection under skin lump at injection site after b12 shot Why do I get painful white bumps after injections? Unexplained painful arm lump diagnosis?

Conditions that are related to mitochondrial dysfunction and reliant on FAD and FMN include Parkinsons disease, Alzheimers, migraines, Complex I deficiency, Alpers syndrome, multiple sclerosis, and Kearns Sayre syndrome.[ref] Nutrient interactions: Riboflavin also helps convert tryptophan to niacin (vitamin B3), which in turn activates vitamin B6 .[ref] It is also essential for the methylation cycle and folate-related metabolism

Public Health 19 , 10396 (2022)

Primary hyperparathyroidism and celiac disease: a population-based cohort study

But your results will also be dependent on the lifestyle choices you make

Or, is iron used by all B12 injections