supplement
Evidence tier: limited
Propolis is the resin honeybees make from plant material to seal and sterilise their hive. On a lesion it calms inflammation, keeps bacteria down, and forms a protective film that takes the pain off. The real trial evidence is on cold sores, where a 0.5% cream matched a standard antiviral. It is a bee product, so an allergy patch test comes first.
Propolis acts through several complementary routes on inflamed mucosal tissue. CAPE and the flavonoid fraction inhibit nuclear factor kappa B signalling and reduce pro inflammatory cytokine expression, addressing the inflammatory component of ulceration. The flavonoids and phenolic acids provide broad antibacterial, antifungal and antiviral activity, reducing secondary colonisation of an open lesion; against herpes simplex specifically, polyphenols appear to interfere with viral attachment and entry rather than replication, which is why timing matters clinically. There is also evidence of stimulated fibroblast proliferation and collagen deposition supporting epithelialisation. In an alcohol tincture, the resin additionally forms a partial protective film over the lesion, which is a mechanical contribution to pain relief distinct from any pharmacological one.
Real but narrower than it is usually presented, and the composition problem is intrinsic. The strongest evidence is in HERPES LABIALIS: Jautova et al. (2019, PMID 30406509), a randomised controlled double blind trial across roughly 397 participants, compared a 0.5% propolis lip cream against aciclovir 5% and found the predefined clinical endpoint reached at a median 3 days with propolis against 4 days with aciclovir. There was NO PLACEBO ARM, so this shows comparability with an active antiviral rather than superiority over no treatment. For RECURRENT APHTHOUS ULCERS there is no trial of a propolis tincture, and any claim of equivalence to a topical corticosteroid is not supported. THE MAJOR LIMITATION IS REPRODUCIBILITY and it cannot be engineered away: propolis composition varies substantially with the botanical sources available to the colony. European propolis is typically poplar dominated and flavonoid rich; Brazilian green and Cuban red propolis have materially different chemistry. Trials run with one type do not straightforwardly generalise to a jar bought elsewhere, and no widely adopted standardisation exists. Grade limited, and never imply batch equivalence.
Topical oral use. Approximately 5 drops of a standard 10% to 30% ethanol propolis tincture diluted into 15 mL of warm water, applied directly to the ulcer on a cotton bud and held for 15 to 30 seconds, 3 to 4 times daily until healed. Trials of proprietary preparations used 0.5% to 3% propolis in ointment or cream bases. No oral systemic dose is established or recommended here.
Do not apply an ethanol tincture neat to an open ulcer; it is intensely painful and dilution does not meaningfully reduce contact with the resin. Alcohol free glycerite versions sting far less and are the better choice for anyone sensitive or for repeated use. Avoid eating or drinking for 30 minutes after application so the resin film remains in contact. Because composition varies by botanical source, a preparation that worked well from one supplier may perform differently from another, and that is a property of the material rather than a fault in the user.
PROPOLIS IS A BEE PRODUCT AND ALLERGY IS THE DOMINANT SAFETY ISSUE. Allergic contact reactions are well documented, including contact stomatitis, cheilitis and contact dermatitis, and propolis is a recognised cause of occupational allergy in beekeepers. A patch test on the inner forearm 24 hours before first use is mandatory, not advisory, particularly for oral use. Do not use at all with any allergy to bees, bee stings, honey or royal jelly, and note documented cross reactivity with poplar and with Balsam of Peru. Swelling of the lips, tongue or throat, difficulty breathing, widespread rash or feeling faint indicates anaphylaxis and is a medical emergency. Alcohol based tinctures sting sharply on an open ulcer and should be diluted, or a glycerite used instead. Propolis has reported mild antiplatelet activity, so use cautiously alongside anticoagulants and mention it before dental extraction or surgery. SEPARATELY AND IMPORTANTLY, any mouth ulcer persisting beyond three weeks is an oral cancer red flag and requires clinical examination regardless of how ordinary it appears; this is the single most consequential piece of safety information attached to any oral ulcer preparation.
Pregnancy: avoid
Breastfeeding: caution
Used in Ancient Egyptian, Greek and Roman medicine for wound care and embalming, and continuously present in Eastern European folk medicine, where it remains a common pharmacy item today. The name derives from the Greek for defence of the city, describing its role in the hive.
Active compounds: caffeic acid phenethyl ester (CAPE), galangin, pinocembrin, chrysin, ferulic acid, cinnamic acid derivatives
Taste: Resinous, bitter and strongly aromatic, with a noticeable numbing quality. Ethanol versions sting on broken tissue.
Remedies using Propolis · Browse by body system · Check it against what you take
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.