Vitamin B12, a crucial nutrient for nerve function, blood cell production, and DNA synthesis, is often supplemented through injections, especially for those who struggle with its absorption or have certain dietary restrictions
If your levels are in the intermediate range, your doctor may also test your levels of MMA and homocysteine
These injections combine vitamin B12 with lipotropic agents to provide a synergistic effect that could aid in the weight loss journey of individuals seeking additional support beyond conventional diet and exercise
However, many people who are deficient are simply this way because their bodies are unable to absorb Vitamin B12 efficiently
PMCID: PMC6770181
Meat, liver, eggs, and milk are therefore sources of the vitamin for other animals, including humans