Oil of Oregano: Benefits, Dosage, and Usage for SIBO
Oregano, often used as a flavourful herb in cooking, goes well beyond the kitchen and offers extra health benefits, notably antimicrobial properties. In this article, I’ll discuss its use against bacterial infections and gastrointestinal issues like Small Intestinal Bacterial Overgrowth (SIBO). You’ll learn about the active ingredients in oil of oregano, and how it compares to pharmaceutical antibiotics in terms of efficacy and potential side effects.
Oil of Oregano as a Natural Antibiotic
While dried oregano is a common spice, oil of oregano proves to be a more potent natural antibiotic due to its active ingredients: thymol and carvacrol.
Carvacrol, present in high concentrations in oregano, demonstrates effective antibacterial properties against various strains, making it a valuable alternative for infections. Studies support carvacrol's efficacy against pathogens like Campylobacter jejuni , Klebsiella pneumoniae and E. coli, amongst others. It has been studied for its biofilm inhibiting properties and antimicrobial activity.
Thymol acts as an anti-inflammatory agent in addition to its antibacterial and antifungal effects.
Oil of Oregano Uses
There is a wide range of applications for oregano oil, from treating bacterial infections and dysbiosis, biofilms and SIBO, to addressing issues like ear infections, colds, flu, sore throat, sinus infections, yeast overgrowth, urinary tract infections, and more. Like in all things, the dosage is highly dependent on the condition we aim to address.
Oil of Oregano vs Pharmaceutical Antibiotics
Oil of Oregano might be natural, but it is also highly potent. You might think that it is simply an herb, but don’t be fooled, the oil in its concentrated form is a very strong one. Because of this, not everyone tolerates it well. However, it is recognised as an alternative to prescription drugs (antibiotics) and is thought to do less damage to the healthy gut bacteria in our microbiome. In general, the “gentler” mechanism of action of oregano oil means that there is a decreased risk of adverse effects that are often seen with prescribed antibiotics. However that doesn’t mean no side effects at all.
Reasons supporting the use of oregano oil over pharmaceutical antibiotics include its presumed microbiome-friendly nature, its broad spectrum action, cost-effectiveness, and a lower likelihood of bacterial resistance. That being said, because it is in fact broad-spectrum, it means that it has very little selectivity towards what it targets. I have found that in higher doses, such as the dosage recommended in the treatment of SIBO, it will inevitably kill good bacteria as well. I have personally seen it deplete microbiomes quite as drastically as antibiotics and for this reason I tend to gravitate towards Oregano Leaf extract instead. It is gentler while still being effective.
In cases of severe overgrowths however, I might still use oil of oregano as part of a 4-6 weeks protocol. Since it has an affinity towards certain strains of pathogenic bacteria, it could be the right fit if you have an infection it is known to target. All in all, it all depends of the condition of your microbiome and the severity of your infection/overgrowth. This is why I always work on a case-to-case basis when recommending antimicrobial herbs.
Potential Oil of Oregano Side Effects
While traditional use in herbal medicine highlights oregano oil's potency as a natural antibiotic, caution is essential. Keep in mind that oregano oil capsules are highly concentrated forms of the compounds compared to the dried oregano leaves you use in cooking.
Prolonged daily use may lead to adverse effects such as nausea, vomiting, gastric distress, tissue irritation, and eradication of beneficial bacteria. Because of this, it is usually contraindicated for people with acid reflux/GERD symptoms. It is to be avoided during pregnancy and lactation. It is best used short-term only, as in a short antimicrobial protocol alongside other herbs.
Using Oil of Oregano to Treat SIBO
Given its robust antimicrobial activity, oregano oil has become a valuable tool in treating Small Intestinal Bacterial Overgrowth (SIBO). SIBO, characterised by bacterial overgrowth in the small intestine, triggers digestive symptoms like gas, bloating, diarrhea, and constipation. For more information on this condition, see my article on SIBO.
While addressing the underlying causes of SIBO is crucial, antimicrobial herbs like oregano can offer an effective SIBO treatment option by reducing bacterial overgrowth. It is important to note that oregano is never used alone. We always use a blend of at least 2 herbs in order to effectively address the overgrowth.
There are many herbs that have antibacterial and antifungal effects and ultimately, the choice comes down to the type of SIBO you have (Hydrogen, Methane (IMO), mixed or Hydrogen Sulfide) and the knowledge and experience of the practitioner you work with. The most common herbs used are Berberine containing herbs (Oregon grape, Coptis, Goldenseal, Barberry), Garlic (Allicin), Thyme and Neem. Keep in mind there are many other herbs and spices known to be extremely helpful against bacterial or fungal infections. Again, this is all on a case-by-case basis.
How to Take Oil of Oregano
Oil of Oregano is commonly available in capsule or liquid form. If you choose to use it in your protocol and under the supervision of a practitioner, make sure to read this section. Not all supplements are created equal.
Selecting high-quality oregano oil is crucial. Make sure you get it from a reputable brand that provides a standardised herbal extract (Carvacrol and/or Thymol) for optimal efficacy.
If opting for the liquid version, you absolutely need to dilute it if the product you got is not already diluted (look at the ingredients). If it’s not already diluted, mix it with the ratio of 1 drop of carrier oil to 1 drop of oregano oil. Combining it with a carrier oil, like coconut or olive oil also aids absorption.
I prefer capsules form because it is easier to dose it with precision. I recommend the emulsified version from the brand Biotics Research as it is gentler on the digestive tract. If using this product, the dosage is 2 capsules, 2 to 3 times per day. Remember that you need to pair it with another herbal for effective treatment. Another good option is Gaia Herbs Oil of Oregano, with a recommended dosage of 3 capsules daily.
For reference, here’s a general dosage guide for Oregano oil (not medical advice):
For SIBO: 200mg capsules 2-3x a day for 4-6 weeks
For colds and flu: 200mg capsules 2-3x a day for 7-10 days
For sore throat: 200mg capsules 2-3x a day for 7-10 days
For infections: 200mg capsules 2-3x a day for 7-10 days
Recap on Oil of Oregano
Oregano oil, with its potent antibacterial properties, stands as a promising natural antibiotic. While caution is needed due to its strength, proper usage and adherence to recommended dosages can provide therapeutic benefits. Oregano oil is also known for its high level of phenol content, delivering natural antioxidant properties. Whether combating bacterial infections, fighting a cold, addressing SIBO, or exploring alternatives to pharmaceutical antibiotics, oregano oil proves to be a natural, versatile and cost-effective solution for short-term use. I highly recommend you consult with me or any other informed health practitioner if you intend on using oregano oil to treat SIBO.
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