vitamin b12 injection how long does it take to work Injections and Weight Loss: Work? How Long Does Vitamin B12

NNMT expression has been found to be elevated in white adipose tissue and correlates with obesity and metabolic dysfunction in various studies

Oral B12 supplementation requires much higher doses to achieve similar therapeutic effects

Written by the Well Labs+ editorial team Last updated July 2026 Category Overview Some vitamins and nutrients are better delivered by injection than by supplement, bypassing digestion so your body can put them to use directly

Support for red blood cells and oxygen delivery At the same time, the B12 goes to work in your bone marrow to facilitate the production of healthy red blood cells and assists in maintaining the nervous system by repairing the protective myelin coating around your nerves