b12 injection is iv or im Sandoz Vitamin Injectable Solution - 1000 mcg/10 mL Compounded Hydroxocobalamin (Vitamin B12) Injection

If youre new to the issue, Vegan B12 Deficiency: Putting It into Perspective, and Safest Source of B12 are good places to start

[DOI] [PubMed] [Google Scholar] 169.Wang, G

Enhance immune function, fights infections, provides cancer treatment support, potentially improve outcomes for patients with COVID-19 and improves immune homeostasis

I also get pain in my right temple ( I wondered if it were to do with the piturity gland ) but wouldn't say I get it as bad as your experiencing mine is more of a dull ache

Oral administration of high-dose vitamin B 12 (1 to 2 mg daily) is considered as effective as intramuscular administration for correcting anemia and neurologic symptoms Despite many studies suggesting oral administration of vitamin B 12 to be easy, effective and less costly than intramuscular administration, debate surrounds the effectiveness of the oral route

Regardless of whether you have diabetes, a medical professional can diagnose low B12 quickly and accurately with just a CBC and B12 blood test level