is oral b12 as good as injections The Shot: What Every Human Needs to Know About Injectable Vitamin B12 B12 Injections and IV Infusion

it does not guarantee that NAD+ therapy is appropriate for everyone

[11] In practice, the benefit of treating a true B deficiency in pregnancy, preventing anemia and neurological injury, is considered to far outweigh any theoretical risks, under the guidance of a healthcare professional

Your vitamin B12 levels can be accurately checked by a simple blood test, which is important for your doctor to know what amounts of Vitamin B12 are suitable for your health requirements

One possible explanation is that low serum vitamin B12 levels would trap folate as 5-methyltetrahydrofolate, prevent the generation of methionine from homocysteine, and therefore reduce protein synthesis and lean tissue deposition