howtosupplement
Digestion/Immunity/Inflammation

Oregano oil

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

Oregano oil

Oregano oil

44
score
C
evidence
Caution
risk
Use with caution

This supplement may interact with medications, medical conditions or sensitive populations. Review safety before use.

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.

Proven Benefits

01
Reduces SIBO symptoms
02
May combat intestinal Candida
03
May reduce intestinal parasites
04
May support immune defense
05
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.

Updated 5/19/2026