The Multifaceted Uses of Propolis in Medicine and Beyond

Propolis is one of the most remarkable substances produced inside a beehive. Often called “bee glue,” this sticky, resinous material does far more than hold the hive together. Humans have used propolis therapeutically for centuries , and modern science is now catching up to what ancient civilizations understood intuitively – that propolis holds powerful medicinal potential. From sterilizing the hive interior to fighting drug-resistant bacteria in clinical settings, propolis bridges the worlds of apiculture and medicine in fascinating ways.

What exactly is propolis? 🔗

Propolis is a natural resinous mixture that honeybees produce by combining plant resins with beeswax and their own salivary enzymes. Worker bees collect these resins from tree buds, sap flows, and other botanical sources . The word “propolis” itself comes from the Greek – “pro” meaning “in front of” or “at the entrance to,” and “polis” meaning “city” . It literally translates to “defender of the city,” a fitting name for a substance that protects the colony in multiple ways.

The composition of propolis is complex. Raw propolis typically contains about 45-55% plant resin, 25-35% beeswax, 5-10% essential and aromatic oils, 5% pollen, and 5% other natural components . However, its exact makeup varies based on the local flora, geography, and season. It is especially rich in polyphenols – particularly flavonoids and phenolic acids – which are the compounds responsible for much of its biological activity .

How bees use propolis inside the hive 🔗

Before we explore what propolis can do for humans, it helps to understand how critical it is for the bees themselves. Inside the hive, propolis serves three broad functions: structural reinforcement, environmental regulation, and disease defence.

Sealing and structural support 🔗

Bees use propolis as a sealant for unwanted gaps and openings in the hive . Every crack, rough surface, and drafty crevice gets coated or filled. This includes narrowing the hive entrance to make it easier to defend against intruders . The substance also serves as a kind of internal glue that holds comb and frames together. According to research by the Russian scientist J. K. Leipus, propolis acts as a natural reinforcement material within the honeycomb, contributing structural strength to the wax cells and enabling them to support heavy loads of honey .

Sterilization and hygiene 🔗

The interior of a beehive is warm (around 35°C) and humid – conditions that would normally be ideal for bacteria and fungi to thrive. Yet hives remain remarkably sterile, and propolis is the reason why. Honeybees use propolis both as a building material and as a method to sterilize and disinfect the hive cavity . A thin resinous layer coats nearly every internal surface. Worker bees ensure that brood cells – where the queen lays her eggs – are lined with propolis to keep them bacteria-free . The hive entrance itself functions as a sterilizing corridor, so that every returning forager passes through a propolis-coated passage before entering the main colony space.

Mummifying intruders 🔗

Sometimes a large intruder, such as a mouse or lizard, enters the hive and is stung to death by the bees. The colony cannot physically remove such a large carcass, and leaving it to decompose would invite dangerous bacteria. The bees respond by covering the entire dead intruder in a thick coating of propolis, effectively mummifying it and making it odourless and harmless . This behaviour was observed by early researchers and remains one of the most striking examples of collective bee intelligence.

Research into the honeybee genome has found that bees have far fewer immune-response genes compared to other mapped insect species . The prevailing explanation is that propolis essentially serves as an external immune system for the colony – the bees rely on this substance to keep the hive healthy rather than investing biological energy in individual immune development.

Propolis as an antibacterial agent 🔗

One of the most well-studied properties of propolis is its antibacterial activity. Propolis demonstrates antimicrobial action particularly against gram-positive bacteria and yeasts . In recent years, as antibiotic resistance has become a global health crisis, propolis has attracted serious scientific attention as a potential alternative.

Propolis extracts, which are rich in polyphenolic compounds, show potent antimicrobial properties and are being studied as viable alternatives to synthetic antibiotics against multidrug-resistant pathogens . A 2025 study published in Scientific Reports evaluated the antibacterial activity of Egyptian propolis extracts against multidrug-resistant urinary tract infection pathogens, and found that propolis extracts, particularly when combined with honey, demonstrated significant antimicrobial effects .

The mechanism behind this antibacterial power involves several pathways. Propolis disrupts the ability of pathogens to invade host cells by forming a physical barrier and inhibiting enzymes needed for cellular invasion . It also interferes with pathogen replication by inhibiting genetic replication enzymes, and disrupts pathogen metabolism by damaging organelles responsible for energy production .

Antiviral and antifungal properties 🔗

Propolis doesn’t stop at bacteria. Antiviral activity has been demonstrated in laboratory and animal experiments, including activity against herpes simplex viruses (types 1 and 2) and influenza viruses . One notable human clinical trial found that a 3% propolis ointment was more effective than the standard antiviral drug acyclovir and a placebo in healing genital herpes lesions . Propolis creams applied topically have also been found to accelerate the healing of cold sores and may offer some protection against future outbreaks .

On the antifungal side, propolis contains pinocembrin, a flavonoid with notable antifungal activity. These combined anti-inflammatory and antimicrobial effects make propolis especially effective for wound healing, including burns .

Propolis in wound healing and skin care 🔗

The use of propolis for wound treatment is not new. Ancient Greeks used propolis to treat abscesses, Assyrians applied it to wounds and tumours to fight infection, and Egyptians used it in the mummification process . Modern science has validated many of these traditional applications.

Research indicates that propolis may stimulate collagen production in the skin, which supports tissue regeneration and wound repair . Current formulations for wound healing include propolis-based ointments, creams, and balms used to treat burns, acne, herpes, and various types of dermatitis . Propolis is now a common ingredient in pharmaceutical and cosmetic products, from anti-acne creams to healing lotions.

Dental health and oral care applications 🔗

One of the most promising areas for propolis application is oral and dental health. Propolis has been used to treat dental caries and mouth infections for centuries , and modern research confirms its value across multiple dental specialties.

Preventing cavities and plaque 🔗

Laboratory studies have shown that propolis extracts reduce the vulnerability of teeth to Streptococcus mutans – the main bacterium behind tooth decay – and limit plaque formation on tooth surfaces . Propolis-based toothpastes have demonstrated inhibitory effects on dental plaque and are now being recommended as adjuncts for patients at higher risk of periodontal problems.

Treating gum disease and oral infections 🔗

Propolis-based preparations can be used as oral hygiene products and in the treatment of oral candidiasis, denture stomatitis, viral infections, aphthous stomatitis, and in endodontic and orthodontic procedures . Subgingival irrigation with propolis extracts during periodontal treatment has yielded better outcomes than standard scaling and root planing alone . The antimicrobial compounds in propolis – particularly pinocembrin, galangin, and caffeic acid phenethyl ester (CAPE) – are believed to inhibit bacterial RNA-polymerase, directly suppressing oral pathogen activity.

Supporting dental pulp and tooth preservation 🔗

Propolis has shown regenerative effects on dental pulp – it not only prevents inflammation and microbial infection but also stimulates stem cells to produce high-quality tubular dentin . It has even been studied as a storage medium for avulsed (knocked-out) teeth, where teeth stored in propolis showed the highest number of viable cells compared to those stored in milk, saline, or Hank’s Balanced Salt Solution .

Anti-inflammatory and immunomodulatory effects 🔗

Chronic inflammation is a driver of many diseases, from arthritis to cardiovascular conditions. Propolis contains high amounts of polyphenolic compounds with antioxidant properties that can inhibit inflammatory cytokine production, mainly through impairing the activity of the NF-κB signalling pathway . This dual role – reducing inflammation while modulating immune response – positions propolis as a potential prophylactic or therapeutic approach to infectious and inflammatory diseases.

When taken orally as a supplement (in capsule or tincture form), propolis acts as an immunomodulator, upregulating innate immunity and helping to maintain the body’s cellular antioxidant status during infection .

Potential role in cancer research 🔗

While propolis is not a cancer cure, the research into its anticancer properties is encouraging. Experimental data indicate that propolis and its active compounds can induce apoptosis (programmed cell death), inhibit tumour cell proliferation, suppress angiogenesis (the formation of new blood vessels that feed tumours), and reduce metastasis in various cancer cell models .

Two compounds have been identified as particularly potent antitumour agents: caffeic acid phenethyl ester (CAPE) from poplar-type propolis and Artepillin C from Baccharis-derived propolis . Additionally, flavonoids from propolis have shown a protective effect against the toxic side effects of chemotherapy drugs and radiation, offering hope that they could allow for higher treatment doses while reducing damage to healthy organs .

Research into propolis and oral cancer has been particularly active. Propolis-based approaches to chemoprevention aim to reduce tumour development with fewer side effects compared to conventional agents . However, in vivo studies remain limited and results can be inconsistent, largely because the chemical composition of propolis varies with geography and plant sources, making standardization difficult .

Cardiovascular, neurological, and metabolic benefits 🔗

The antioxidant richness of propolis extends its potential benefits well beyond antimicrobial and anticancer activity. Polyphenol-rich supplements like propolis may reduce the risk of high cholesterol, heart disease, and stroke . The same body of research has noted possible neuroprotective effects against conditions like multiple sclerosis, Parkinson’s disease, and dementia .

Recent reviews also highlight the potential of propolis in managing metabolic disorders including diabetes, as well as gastrointestinal diseases and reproductive conditions like PCOS . While much of this evidence comes from preclinical studies, the breadth of propolis’s pharmacological activity makes it one of the most versatile natural substances under investigation today.

Precautions and limitations 🔗

Despite its impressive therapeutic profile, propolis is not without risks. As a bee product, it can cause allergic reactions – particularly in individuals with existing allergies to bees, honey, or pollen . People with asthma should use it cautiously, and those with bleeding disorders or upcoming surgery should avoid it, since some propolis compounds may slow blood clotting. There is also insufficient safety data on propolis use during pregnancy .

Another challenge for researchers and manufacturers is standardization. The variability in propolis’s chemical composition due to geographical and botanical factors, along with the lack of standardized extracts, continues to impede translational research . Propolis from a Brazilian forest will differ chemically from propolis collected in a European meadow, making it difficult to draw universal conclusions about dosage and efficacy.

Commercial forms and everyday uses 🔗

Propolis has been used in folk medicine since around 300 BC and today it is available in a range of commercial forms . These include capsules, alcohol-based tinctures, glycerin extracts, mouthwashes, throat lozenges, toothpastes, ointments, and cosmetic creams. Annual propolis sales in the United States alone are estimated at around 40,000 pounds per year . Beyond health products, propolis is also used by some string-instrument makers as a varnish ingredient .

For beekeepers interested in harvesting propolis, the process is straightforward. A flexible plastic screen with narrow slits is placed on top of the hive frames, and the bees will fill in the gaps with propolis over time . Freezing the screen makes the propolis brittle and easy to collect.

The bigger picture 🔗

Propolis is a substance that sits at the intersection of nature and science. For bees, it is a survival tool – a multifunctional material that keeps the colony structurally sound, hygienically clean, and protected from threats. For humans, it represents a growing frontier in natural medicine, with validated antibacterial, antiviral, antifungal, anti-inflammatory, and anticancer properties. The challenge going forward is to standardize propolis research and develop consistent, evidence-based formulations that can be safely integrated into mainstream healthcare.

What do you think? Given that propolis composition varies so widely depending on geography and plant sources, can it ever be standardized enough for mainstream pharmaceutical use? And should beekeepers balance the health benefits of harvesting propolis against the colony’s own need for it?

References

1. https://pmc.ncbi.nlm.nih.gov/articles/PMC3872021/
2. https://beeculture.com/processing-propolis-part-1/
3. https://beevitalpropolis.com/pages/the-role-of-propolis-in-the-beehive
4. https://www.nature.com/articles/s41598-025-00773-1
5. https://www.mdpi.com/2304-8158/10/6/1360
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC4083525/
7. https://link.springer.com/article/10.1007/s43621-024-00375-3