The exact way it works is still not clear
There is some evidence that the diabetes drug metformin (Glucophage) may reduce vitamin B12 absorption when used for several years
Laurel MD Table of Contents: How long does Lipo shots take to work
Oral supplements work for many people, and injections are another reliable option, especially for those who are already symptomatic and confirmed low
We advise that you read as much medical research as possible about B-Vitamin injections, uses, and dosages pertaining to your individual use, such as weight-loss, extra energy, bolstering your immune system, stress, nerve repair, neurological improvement for cognitive abilities or diseases that require injecting vitamin B-Complex
As with vegetarians, vegans can avoid this by consuming a dietary supplement or eating B 12 fortified food such as cereal, plant-based milks, and nutritional yeast as a regular part of their diet