does vitamin b12 injection help with fatigue low energy I Feel Tired All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 Injection: Benefits, Uses
Description
Vitamin B12 is crucial for erythropoiesis (red blood cell production), proper digestion and energy utilization

Lyophilization is a dehydration technique in which compounds are frozen and then exposed to low pressure

PMID 17959839

There is not as much evidence regarding long-term efficacy or safety of gel vitamin B12 compared to injections, but at this time it appears B12 gel works similarly to raise blood levels

High folic acid intake can also mask symptoms of vitamin B12 deficiency