Vitamin B12 is essential for energy production, nervous system function, and red blood cell formation. However, oral B12 supplementation doesn't work well for everyoneabsorption can be limited by digestive issues, certain medications, Lipo B12 injections are given weekly and packed with substances that benefit your overall health and well being, including: Methionine, an amino acid that helps your body process fat through your liver Inositol, which How Quickly Do Vitamin B12 Injections Work? Education How Long Does It Take for B12 Injections to Work? Soza Clinic