where is b12 injected Best Vitamin Injection Site: Administering B12 Shots Treating Severe Vitamin B12 Deficiency
Description
While oral supplements may be effective for some, the bodys ability to absorb them often decreases with age
However, it may take a few days or weeks before your symptoms start to improve
doi: 10.1016/0742-8413(85)90175-6
The Lancet 391 , 16721685, (2018)
