Strengthening your core systems is crucial to healing.  Sensitive patients may spend the majority of their time working here, and it's not time wasted. Adding too many toxins before the body is ready can hinder progress.

A strong core will equip your body to fight and eliminate infections as well as better handle the increased stress.  In the end, it's our immune system that needs to take over the final fight to eradicate or keep the infections in check. 

The components overlap.   Our systems all rely upon each other and it's impossible to talk about supporting the immune system without talking about nutrition and the gut, just as it's impossible to talk about detox without the same components.  Gut health is central to everything, and nutrition status is the one current running under and connecting everything.

I make use of Functional Testing as much as is feasible.  In addition to regular blood labs, gut microbiome and micronutrient testing are especially important for assessing overall core system strength, and these tests give us a lot of information to work from.  It can also be very useful to have additional information from genomic testing and organic acids if we need to drill into trouble areas.  I also always recommend testing for other toxic burdens such as mold and heavy metals, as they can affect our core systems and hinder progress.