where should i inject vitamin b12 to How to Self-Inject Vitamin B12

Evidence from Clinical Studies Numerous randomised controlled trials and systematic reviews (including the Cochrane reviews) show that using high-dose oral vitamin B12 is as effective as injecting intramuscularly with vitamin B12 in improving serum vitamin B12 level, haemoglobin concentration, and neurological symptoms for patients with a moderate to mild deficiency in vitamin B12

Younger adults with accelerated aging from stress: Prevents premature decline

More serious complications of B12 deficiency and anemia can lead to serious long-term complications and permanent damage

no clinically significant changes in glucose, lipids, or hormone panels were observed