Propolis for Canker Sores: Oral Films, Capsules and Uncertain Benefits

A small trial tested a specially prepared oral film

The 2018 trial¹ enrolled 24 people, including 16 women, with recently developed aphthous ulcers. Twelve received a propolis-containing adhesive film twice daily; twelve received a similar film without the active component.¹

Five of twelve propolis participants reported complete healing within five days, compared with none receiving placebo. The remaining propolis participants reported healing between days five and ten. Outcomes came from patient checklists. The authors funded the work.¹

This was an engineered delivery film containing propolis in tiny carrier vesicles. Its results cannot establish what happens when a person puts an ordinary propolis tincture on a sore.¹

The capsule pilot asked about future outbreaks

The 2007 pilot compared a daily 500 mg propolis capsule with placebo. It assessed whether outbreak frequency fell by at least 50%, using participants’ reported baseline frequency and follow-up contacts. The original abstract reports a favorable one-sided statistical test, P = 0.04; the full paper was unavailable for this review.²

The later systematic review identifies 19 participants in that pilot. Its estimate for achieving a greater-than-50% reduction in relapses was very imprecise, with a confidence interval that included no benefit.³

What the broader review could establish

The 2024 review included ten trials and 825 participants, searching through May 2022. Preparations included mouthwashes, pastes, sprays and swallowed products, with different concentrations and carriers. The overall certainty was very low.³

For complete healing time, three topical studies involving 154 participants produced an estimated 1.92-day reduction, with a 95% confidence interval from 5.36 days shorter to 1.52 days longer. That result leaves substantial uncertainty about the benefit. Some pain outcomes favored propolis, also with very-low-certainty evidence.³

Allergy can resemble the problem being treated

DermNet⁴ lists burning, inflamed lips and mouth ulcers among possible manifestations of propolis contact allergy. If symptoms appear or worsen after a propolis product, stop using it and seek advice. Bring the packaging; avoidance of the responsible ingredient is central to managing contact allergy.⁴

Ask a dentist or pharmacist whether the product and intended outcome match any useful evidence: healing this sore, reducing pain or preventing recurrences. Record the start date, where the ulcer is, when it heals and any reaction to treatment.

See a dentist or doctor for an ulcer lasting longer than three weeks, one different from your usual ulcers, or one that bleeds or becomes more painful and red.⁵

“The Red-Flag List” in Chapter 3 of Is It My Breath? explains which persistent mouth changes need examination. A supplement trial cannot identify the cause of an unexplained sore.