I also experience severe herxes from any one of a number of anti-microbial herbs
eg
sida acuta
mahonia aquafolium root ( berberine containing herb)
teasel root
etc
the problem is all of these herbs ( and most substances you could try ) are broad-spectrum in their antibacterial action.
many are also have antifungal properties
also, herbs, in general, contain a wide array of chemicals rather than a single refined substance - many of these are active in various ways in the body and any one person could have a reaction to any one of these active substances that presents much like a herx.
for instance, they could increase or decrease the permeability of the gut - changing symptoms through that mechanism
This means that, if a substance did provoke a herx like reaction, this could potentially be due to a whole array of potential mechanisms, making the picture cloudy at best
mechanisms may include:
1, killing unidentified pathogenic bacteria infecting the body systemically
2, killing unidentified pathogenic bacteria in some localized niche in the body (not a systemic infection)
3, killing normal commensal gut bacteria and triggering immune reactions and symptoms in response to their LPS by-products and fragments - eg especially in persons with increased gut permeability
4, killing normal or overgrown fungal organisms in the gut - and thereby releasing toxins/fragments that trigger immune reactions etc.
5, by increasing gut permeability - allowing bacteria, and bacterial by-products to enter the body
6, by some other direct reaction to the active substances or their metabolized by-products in persons who are sensitive ( many in the Lyme community)
etc
of these, I suspect the reaction to killing commensal organisms is the most common one as a high percentage as something like 20% of "healthy persons" are found to have conditions such as SIBO and Leaky gut ( according to the scientific papers). The proportion of chronically sick people with a hyperpermeable gut membrane is likely to be higher than that - leading to a high false-positive rate.
all this makes interpreting a herx type trial rather difficult in my view:
It may, however, be useful in the context of several other tests via different methods to help build a better picture