b12 injections and iron deficiency Cobalamin (vitamin B12) Folate Vitamin B12 Deficiency: Symptoms, Causes
Description
Potential Side Effects and Limited Human Data While preclinical studies have not shown significant toxicity at standard doses, the research in humans is still in its early stages
Doets EL, Int Veld PH, Szczecinska A, et al

Vitamin B12 deficiency A 21st century perspective

For dietary deficiency, NICE CKS suggests taking oral cyanocobalamin between meals

Can Lipo B12 Injections help with fatigue