The effect of oregano oil

Oregano oil works both internally and externally. I’m using it….

In this article I would like to mention the reasons why oregano oil with its effect is the perfect remedy for my intestinal cleanser. The recipe for the intestinal cleanser can be found here: Intestinal Cleansing InstructionDocumentation

Commonly known effect of oregano oil

  • antimycotic/antifungal
  • antibiotic/antibacterial
  • Antiviral
  • Antiparasitic (against worms and co.)
  • antioxidant

On the Internet, you can find information everywhere that oregano oil is even supposed to destroy the infamous MRSA germs (multi-resistant germs). I assume that oregano oil has a very high potential, if such a thing is claimed. I haven’t found any evidence yet. Of course, the pharmaceutical industry is not exactly interested in making this known. So who should finance such studies?

For Clostridium perfringens, Escheria Coli, Candida Albicans and 3 Salmonella species I found evidence. I am sure that oregano oil also has an effect on other Clostridia sp. It has not yet been investigated because no one is interested in demonstrating the effect of an unpatentable substance. :-)

Does oregano oil also inhibit good intestinal bacteria?

In short: No. The long variant: No, I only found evidence for some Lactobacillus species that were only inhibited in very large quantities, while pathogenic intestinal bacteria were inhibited in small quantities. But read it yourself:

The story of my understanding: in many sources I have read, it has been claimed that oregano oil makes no distinction between good and evil. So: All bacteria are destroyed, both the good and the bad. I was already familiar with these side effects from antibiotics and could do without them. I researched further.

In an American forum, I came across a post office where someone took the test to mix oregano oil with the milk he wanted to use to prepare his own yoghurt. The assumption was that the good lactobacilli, which should acidify the milk, would refuse to serve if they were inhibited by oregano oil. And?

The yoghurt tasted gruesome, but this was due more to the oregano oil. The milk had become yoghurt, acidified by lactic acid bacteria, which apparently produced without being influenced by oregano oil. Isn’t it all going to get wiped out?

Translated with

A trial: Yoghurt preparation with oregano oil

One of my readers, Vinko, was kind enough to prepare yoghurt with oregano oil. I would say experiment succeeded:


Vinko summarized the result as follows:

It is impossible to tell the difference in consistency (independently of the amount of oil) in taste and smell (after oregano oil; -)).
I would like to strongly recommend the following:

More Oregano Oil Experiments by Vinko

After two AB-treatments due to a borreliosis infection, my health went downhill. After a stool examination, the doctor said that I had a fungal infection in the intestine, prescribed Nystatin and Symbioflor (I think). I took it for a month (but didn’t change my diet), I was much better in that time, I rode my bike twice a week in the mountains for two hours, had more energy again. Unfortunately, after about three or four months the mountain went down again. In the years since then I have tried many things, one has benefited something, the other has not. I have noticed that it doesn’t do me good to eat a lot of meat or dairy products. At some point I came across the theme of’ Clostridia’ and’ Oregano Oil’ (by Philip and’ Chronic Healing’). Like most of us, I have read through the internet, many claims, but no scientific studies on efficacy (as with other’ miracle cures’). So, I decided to do some tests myself. The first test was with yoghurt and oregano oil (inspired by Philipp’s article). This proved to me that oregano oil does not harm the lactic acid bacteria (at least not excessively).


In the next test I put two glasses of milk, one with oregano oil, the other without, for a few days at room temperature. After three or four days the milk without oil was clearly spoiled and stank, the other one looked quite fresh (although I didn’t want to try it out). After another three or four days, the milk with oregano oil has also gone bad, but I cannot say what caused this. This would have required a microbiological examination. That was proof enough that the oil is effective against some germs, if not against all.

Tomato sauce and oregano oil


On the Internet I also found some information about the effect of oil on the (mould) fungi. That’s what I wanted to test. I took some tomato sauce (organic quality to be sure that there are no preservatives in it), left the glasses uncovered at room temperature, again one with oil, one without). In the glass with oil there were no mushrooms, in the other one already (see picture). When I dripped a drop of oregano oil into the glass with mould, they did not develop further. But I can’t say if they are dead, because I disposed of the glasses a few days later.


Apple slices and oregano oil


I took another test with two apple slices. One I drizzled with the oil, one not, put it in a plastic box (together) and left it for a few days. After a few days, nothing happened. The apple slices have changed colour a bit, but no trace of mould. I decided to help myself a little bit and infected her with mould. I expected that at least the apple slice would go mouldy without the oil, but that didn’t happen. Only after about three weeks did the first traces of mould appear. I came to the conclusion that the oil fumes alone were enough to prevent the formation of mould on the windshield without oil (they were in a box together, see photo).


These tests convinced me that the oil has a very good effect’ in vitro’ against some undesirable germs (especially against the fungi).

If this was a patentable substance, these results would suffice to carry out expensive studies.[/learn_more]

Many thanks at this point. It’s more and more fun to run this blog when you experience such support. Thank you, Vinko!

At this point it is important to mention that the oregano oil used has a very high carvacrol content compared to many other oregano oil varieties on the market.

Now it’s going to be scientific:


Thereupon I found a Study, which should prove to me that essential oils Carvacrol and Thymol as constituents of oregano oil did not inhibit beneficial bacteria studied in this study.

The following table shows the results of in-vitro study. Only a small amount of Carvacrol or Thymol was necessary to inhibit or even kill Clostridium perfringens and other pathogenic germs in their growth. The amount of bactericidal bacteria for the pathogenic germs would not even have suppressed the lactobacilli tested. Exception of the Salmonella Enteritidis killing value 1500 in thymol, which has an inhibitory effect on the lactobacilli but does not kill.



BakterienMIC (μg/mL) = hemmende WirkungMBC (μg/mL) = Bakterienabtötende WirkungFICI
Escherichia coli750187.537515003757500,5
Clostridium perfringens75037537515007507500,5
Salmonella Typhimurium75037537515007507500,5
Salmonella Enteritidis750750187.5150015007501,0
Lactobacillus acidophilus3000150015003000300030001,0
Lactobacillus reuteri3000150015003000300030001,0
Lactobacillus salivarius3000150015003000300030001,0
  • MIC (minimum inhibitory concentration = the minimum amount to create an inhibitory effect)
  • MBC (Minimal Bactericidal Concentration = the minimum bactericidal concentration to kill bacteria)
  • EO (Essential Oil = essential oil, contains 25% thymol and 25% carvacrol)
  • FICI (Fractional Inhibitory Concentration Index)

With the help of the newly linked source, you will also learn that the supplementation of chickens led to a decrease in Clostridium perfringens and Escherichiia Coli, but also to an increase in the amount of lactobacilli.

The increase, in my humble opinion, was due to the lack of “the enemy”. That is also the reason why I find intestinal cleansing with oregano oil so useful before building up the intestine.

After finding out something so positive about the effect of oregano oil on clostridia, I found further convincing studies on the effect of carvacrol on Candida Albicans. For the sake of simplicity, here are just two of them with the source and a short explanation:

Please leave a comment if you have experience in this area. Have you successfully rehabilitated your intestine with oregano oil and want to share your experience with others? You can also write write, so that I can publish your story . Contact form


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