The following three-test approach, described by Carmel (2008, Annual Review of Nutrition), gives a more complete picture: Serum B12
That being said, neither study specifically states how much one must take of vitamin B12 (or folate) for their blood serum levels to register as either "very high" or "extremely high." For that reason, although vitamin B12 (and folate) supplementation are important during pregnancy, it's best to look to your healthcare provider for guidance
Many people choose B12 injections for general wellbeing and energy support even without a clinical deficiency
What causes dementia
Some people pursue vitamin B12 shots because they believe that doing so will increase their energy levels
Common Symptoms of Low Vitamin B12 Symptoms of low vitamin B12 include fatigue, weakness, tingling in hands and feet, and difficulty concentrating