The time it takes to feel refreshed after receiving a B12 shot can vary depending on your individual health, lifestyle, and the severity of your deficiency
[2] However, elevated MMA is not conclusive, as it is seen in people with B 12 deficiency, but also in elderly people who have renal insufficiency, [28] and elevated homocysteine is not conclusive, as it is also seen in people with folate deficiency
A simple blood test can determine your levels and guide your treatment plan
Prescription Vitamin B12 Injection Products Today, there are many prescription vitamin B12 injection products
B12 shot for energy restores mental sharpness
Prepping for an Intramuscular Shot An intramuscular (IM) injection delivers vitamin B12 directly into a muscle, usually in the upper arm, thigh, or upper buttocks