pros and cons of b12 injections vitamin injection composition Benefits B12 for Optimal Health Boost Your Energy, Blast Fat:

There are practical reasons too: B can be unstable if mixed with certain other vitamins in solution, and dosing schedules for B deficiency (pernicious anemia, for instance) may differ

B12 deficiency may show itself as feeling fatigued, constipated, depressed or even dizzy

However, its common for blood tests to reveal inaccurate information regarding B12 levels since a high percentage is stored in the liver and not always revealed through testing (for example, taking large amounts of folic acid has been found to mask vitamin B12 deficiency in some patients)

Here's the short version: B12 itself doesn't deplete iron

The mechanisms are different and do not directly conflict, but absence of conflict is not the same as evidence of benefit