b12 injections not working chronic fatigue Fatigue: Can Shots Make You Tired? · PA Relief Vitamin B12 deficiency - Wikipedia

As research grows, thoughtful design and personalized treatment plans may be key to unlocking their full potential.

Farhan Abdullah walks through what the research actually shows, why it doesn't raise IGF-1 or blood sugar, who it works best for, and how we use it at Magnolia Functional Wellness in Southlake, TX

Some research from Germany has shown that an even higher threshold (over 500 pg/mL) is necessary in early-to-mid pregnancy to maintain vitamin B12 levels throughout pregnancy, lactation, and to support an infants vitamin B12 status (via breast milk) through 6 months of age

This is because it is the active form of the vitamin, and the body can use it immediately