The length of time B12 takes to work depends on your age and gut health, and how your body processes the vitamin
If your B12 level is found to be below normal, replacing that vitamin B12 is very important, explains family physician Kenneth Goodman, MD
Whether youre looking to boost your energy, improve your mood, or address a deficiency, B-12 injections can be an effective treatment option tailored to your individual goals
For a regular patient with vitamin B12 deficiency, the doctors usually start with a high dosage
In contrast, injections can show results in just a few days
Oral supplements pass through the digestive tract to be absorbed by the bloodstream, and much of the nutrient is lost in this process