Its also important for the formation of brain and nerve cells
The above is usually talked of in terms of 'anaemia', but it does show that there is a complicated link between B12, B6, folic acid, zinc and vitamin D levels, chronic disease (anaemia of chronic disease) and how the body 'manages' serum iron, ferritin, and transferrin iron saturation and keeps these in balance (or not, as in your case)
This is why you might take supplements for months and still not feel a difference
As well, methylation helps to produce neurotransmitters for memory, concentration, and mood
Use of compounded medications involves potential risks and should be discussed with a qualified healthcare provider