Digestion/Immunity/Inflammation

Oregano oil

Concentrated essential oil of Origanum vulgare used primarily for small intestinal bacterial overgrowth and gut dysbiosis.

Oregano oil

Concentrated essential oil of Origanum vulgare used primarily for small intestinal bacterial overgrowth and gut dysbiosis.

score

evidence

Caution

risk

Overview

Forms

Safety

Stack

Quick Take

Consider only for confirmed SIBO or dysbiosis under guidance; evidence outside gut health is weak and preliminary.

Oregano oil is a concentrated essential oil extracted from Origanum vulgare leaves. Its active compounds, carvacrol and thymol, exert broad antimicrobial effects against bacteria, fungi, and parasites in vitro and in limited human trials. The strongest evidence supports its use in herbal antimicrobial protocols for small intestinal bacterial overgrowth (SIBO). Some small studies suggest modest antifungal and antiparasitic effects in the gut. Outside digestive health, evidence is largely mechanistic or animal-based. It is most relevant for people with diagnosed SIBO, recurrent candida overgrowt

Proven Benefits

Reduces SIBO symptoms

May combat intestinal Candida

May reduce intestinal parasites

May support immune defense

May lower inflammatory markers

Protocol

Amount

150-300 mg

Frequency

1-2 times daily with meals

When

With food to minimize stomach irritation; divide into two doses if taking more than 150 mg daily.

Onset Time

2-4 weeks for gut symptom relief; antimicrobial protocols often run 4-6 weeks.

Who Should Consider

People with diagnosed SIBO or IMO

Those with recurrent intestinal Candida overgrowth

Individuals with parasitic infections under clinical care

People seeking herbal antimicrobial alternatives

How It Works

Carvacrol and thymol disrupt microbial cell membranes and inhibit biofilm formation, showing antibacterial, antifungal, and antiparasitic effects in laboratory studies. In humans, these compounds may shift gut microbiota composition and reduce pathogenic load, though direct mechanistic confirmation in vivo is limited. Some evidence suggests weak inhibition of pro-inflammatory enzymes such as COX-2

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