There may be cases when you're getting enough of a nutrient from your diet or your blood levels are in the "normal" range, but your body isn't effectively utilizing it
However, the compound became widely available for routine use in the treatment of B12 deficiency in the early 1950s (8)
Vitamin B-Complex Injection can be given either intramuscularly (IM), usually into a large muscle like the upper outer buttock (gluteal muscle) or thigh, subcutaneously (SQ) or sometimes intravenously (IV) as a slow injection in a clinical setting
Your GP can arrange appropriate testing, interpret results in the context of your individual circumstances, and recommend the most suitable management strategy
If you restrict most or all of these wonderful vitamin B12 sources from your diet, you are at a high risk of vitamin B12 deficiency
Other studies have found that the differences in absorption and retention are minimal