thanks for the calculation link Hip.
It's interesting, and I know it's only intended as a ballpark start point but I'm having trouble reconciling the maths with logic.
A similar later study by the same authors I think - was the one I had in mind - it looked at further essential oils for their effects on "stationary phase" Borrelia (which I think refer to Persister forms that are believed to be a key borrelial mechanism involved in keeping chronic lyme patients ill).
They expressed the concentrations of the oils used as % making the calculation a bit more straightforward ( as molecular weights not needed )
full article here:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6316231/
with this excerpt showing those with the highest activity.
Effect of active essential oils on stationary phase B. burgdorferi. A 1 mL B. burgdorferi stationary phase culture (seven-day old) was treated with 0.1% (A) or 0.05% (B) essential oils (labeled on the image) in 1.5 mL Eppendorf tubes for 7 days followed by staining with SYBR Green I/PI viability assay and fluorescence microscopy.
if we were to make the following assumptions:
1, that to treat a chronic Borrelia infection, you would need to reach similar concentrations to the study
2, and that this concentration would need to be achieved in all patient tissues (due to the organisms known ability to infect any tissue, and particularly protected niches in the body such as intracellular compartments, cartilage, skin, aqueous humor in the eye etc etc) - not just blood / serum
3, that the human body is approx 80% solvents of some kind within which the volatile oils or their components can be dissolved or dispersed -
4, that this 80& of body mass would become the total effective solvent mass in the equation.
5, assume some mid-range figure for bioavailability - say 50% as in the previous example
we would then calculate a very different rough and ready amount of volatile oil needed.
eg
I guess this approach assumes uniform dispersion throughout all tissues (in reality i know drugs vary dramatically in how well they do this some stay in teh blood more than others - but for chronic Lyme it is exactly what you would prefer) - and that the body excretes or transforms about the same amount that is absorbed each day. Which seems a reasonable place to start.
I have not read into the pharmacokinetics of volatile oils in any detail - so am coming at this subject cold - but generally, I like to sanity check any calculation method for an order of magnitude result vs a rational approach from first principles to see how well they agree and try to understand major differences if they exist.
I'm not saying my rough and ready method is correct - just that the differences between the two concern me a little.
I guess there are a lot of variables we do not know and perhaps the 2 calculations represent upper and lower limits of where it's possible the true value lies. But this is how I came to the conclusion it might be difficult to do in practice.
On the other hand, it could well be that essential oils, even at much lower than in-vitro study concentrations inhibit cellular functions of borrelia and possibly even that a cocktail of such compounds could be effective in weakening cell walls or other essential functions of the spirochete if used as adjuncts to antibiotics or other natural bactericidals ( This use as an adjunct to ABX is the one I was most interested in).
btw - I am open to it - and I have even taken a very high-quality oregano essential oil at around 9 drops a day for a few weeks to try to treat suspected dysbiosis - but unfortunately without obvious benefit to any of the symptoms (gut or systemic) at that time ( now belive it was Lyme disease all along). As I recall I discontinued due to the lack of perceived benefit and also concerns that concentrated oregano oil might be damaging to the gut if sustained. I think i read that from some reputable source at the time - but it's long ago now.