Depending on your body and the severity of your deficiency, B12 injections can start to work in a matter of hours to a few days
In addition to the conditions mentioned above, several risk factors increase the likelihood of B12 deficiency: Smoking Alcohol abuse Endocrine-related autoimmune disorders (such as diabetes or thyroid disorders) Gastrointestinal disorders like Crohns disease History of gastric bypass surgery or other stomach-altering surgeries Optimize Your Health
Certain populations, including older adults and people following a vegan diet, are at a higher risk of vitamin B12 deficiencies and may benefit from taking a vitamin B12 supplement
This not only fixes the deficiency but also makes life better for those affected
Observed effects in human trials Reported adverse events across the IV and oral trials included headache, fatigue, dizziness, nasopharyngitis, diarrhea, flatulence, increased appetite, nausea, and back pain