You could be spending good money on something that wont fix the problem
The exact dose may change based on individual needs and the severity of the deficiency
How Often Can I Take B12 Injections
B12 shots for malabsorption or dietary restriction Vegans, vegetarians, older adults, and people with GI conditions (Crohn's disease, celiac disease, pernicious anemia) commonly have inadequate B12 absorption
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222
Research is ongoing in this area for individuals without a deficiency, but if you have a deficiency, vitamin B12 injections may help fight fatigue, weakness, and other symptoms