A vitamin B12 blood test is a reliable way to determine if you have adequate levels of this crucial nutrient. Vitamin B12 is essential for nerve function, making red blood cells, and helping your ...

Medically reviewed by Sohaib Imtiaz, MD Key Takeaways Take vitamin B12 on an empty stomach in the morning or early afternoon ...

Expect to take a blood test to check your vitamin B12 levels before adding a supplement or shot. One of the best ways to maximize absorption is through proper gut health. Before trying ...