which is the best b12 injection what or tablets Advantages of B12 Injections Versus Oral Supplements: Shawn Veiseh, M.D.: Family Medicine B12 Injections at Olympia

The evidence is preclinical (mouse and cell studies)

These shots are typically quick and easy to administer, and they can benefit individuals who have difficulty absorbing B12 from food or supplements

If you find the 45 unit mark uncomfortably small to read, the honest options are (a) use a finer-gradation syringe, or (b) follow a protocol built around the 50 mg vial, whose larger draw is more forgiving not to freehand a bigger volume from the 10 mg vial, which would silently overdose relative to the documented figure

Intramuscular shots put B12 right into the muscle

This timeline allows the body to adapt to improved NAD+ availability and mitochondrial function