Propolis: Benefits, Evidence and Safety

Bee propolis is sold as throat sprays, tinctures, capsules and lip balms for colds, cold sores, blood sugar and “immune support.” We read the randomized trials, the meta-analyses and the allergy data. This page is unpaid, lists no prices and recommends no brand.

Updated November 2026 · Supplements · 10 min read

Quick Answer: Propolis (“bee glue”) is the sticky resin honeybees collect from tree buds and plants to seal their hives. Its best human evidence is topical: in two randomized trials of about 400 and 380 people, a 0.5% propolis lip cream healed cold sores about one day faster than 5% acyclovir cream (median 3 vs 4 days and 4 vs 5 days). A standardized propolis throat spray shortened mild sore-throat symptoms in a 122-person placebo-controlled trial. Oral propolis capsules produce modest drops in fasting blood sugar (about 10 mg/dL), HbA1c (about 0.5 percentage points) and LDL cholesterol in meta-analyses of small trials, which is far smaller than diabetes or cholesterol medicines. The main risk is allergy: propolis is a well-known contact allergen, with patch-test positive rates of 2–15% in North American clinics depending on the test material. Skip it if you are allergic to bee products, balsam of Peru or poplar, and check with your doctor before using it for any medical condition.

Propolis Claims, Graded Against the Research

ClaimWhat human studies showOur read
Heals cold sores0.5% propolis (GH 2002) lip cream vs 5% acyclovir: median 3 vs 4 days to crusting/healing (n=397) and 4 vs 5 days (n=379); both p<0.0001Best-supported use; one proprietary extract
Genital herpesOne 90-person trial: 24 of 30 healed by day 10 on propolis ointment vs 14 of 30 on acyclovir and 12 of 30 on placebo (Vynograd 2000)Interesting, small, single-blind, old
Sore throat / coldsThroat spray (12–24 mg polyphenols/day) vs placebo in 122 adults: 83% symptom-free at day 3, while 72% on placebo still had at least one symptom (Esposito 2021)Promising for mild symptoms; one trial
Blood sugarMeta-analysis of 21 RCTs: fasting glucose −9.75 mg/dL, HbA1c −0.46% (Adeli 2024)Modest; small, mixed-quality trials
Cholesterol and blood pressureLDL −9.31 mg/dL, triglycerides −10.44 mg/dL, systolic BP −2.24 mmHg; no change in total cholesterol or diastolic BP (Bahari 2025)Small effects; not a replacement for treatment
Mouth healthPropolis toothpastes and rinses lowered plaque vs no active product and were not significantly different from chlorhexidine, but certainty was “very low” across 45 RCTs (Berto 2026)Plausible adjunct, weak evidence
COVID-19A 124-patient open-label trial found shorter hospital stays; the larger 188-patient placebo-controlled follow-up (BeeCovid2) did notNot established

Details come from the sources at the bottom of this page. “Our read” is an editorial summary of study size and design, not a formal evidence grade.

What Propolis Actually Is

Bees make propolis by mixing plant resins, mostly from tree buds, with beeswax and their own secretions, then use it to seal cracks and coat the inside of the hive. Dermatologist Anton de Groot’s 2013 review in Dermatitis describes it as having antibacterial, antifungal and antiviral activity in laboratory studies, which is why it shows up in lozenges, toothpastes, lip balms, cosmetics and supplements.

The key point for shoppers is that propolis is not one standard ingredient. Its chemistry depends on which plants the bees visited:

  • Poplar-type propolis (Europe, North America, China) is rich in flavonoids and caffeic acid esters such as CAPE. The throat-spray trial below used a standardized poplar-type extract.
  • Brazilian green propolis comes largely from the plant Baccharis dracunculifolia and is known for artepillin C. The COVID-19 trials used a standardized green propolis extract.
  • Red, Cuban and stingless-bee propolis have different profiles again.

That variability matters. A study result for one standardized extract does not automatically apply to a different propolis tincture on a store shelf, and as the allergy data below show, two “propolis” materials can behave very differently on the skin.

Common forms

  • Throat sprays and lozenges, often mixed with honey, zinc or herbal extracts
  • Tinctures (alcohol or glycerin extracts), dropped into water or onto the tongue
  • Capsules and tablets of dried extract, with widely varying amounts per serving
  • Lip balms, creams and ointments for cold sores and minor skin problems
  • Toothpastes and mouthwashes

Cold Sores: The Strongest Case for Propolis

The best-designed propolis trials are for herpes labialis (cold sores). Both compared a lip cream containing 0.5% of a propolis special extract called GH 2002 against 5% acyclovir cream, a standard antiviral, applied five times a day:

  • Jautová 2019 (double-blind, 397 patients in the blister stage): lesions reached complete crusting or healing after a median of 3 days with propolis vs 4 days with acyclovir (p<0.0001). Pain, burning, itching, tension and swelling also favored propolis, and no allergic reactions or irritation were reported.
  • Arenberger 2018 (single-blind, 379 patients at the earlier red/bump stage): a median of 4 days vs 5 days (p<0.0001), again with no adverse events reported.

Two meta-analyses pooling these and smaller studies reached the same direction. A 2026 analysis of seven studies found that propolis and/or honey healed lesions about 1.9 days faster than 5% acyclovir and roughly quadrupled the odds of being healed by day 7 (odds ratio 4.71), with similar side-effect rates.

Caveats. The two big trials used the same proprietary extract, so results for other propolis products are unknown. The comparator was acyclovir cream, which only modestly shortens outbreaks on its own; neither trial compared propolis with oral antivirals such as valacyclovir, which doctors prescribe for frequent or severe outbreaks. If you get cold sores often, our Abreva vs lysine comparison covers the other over-the-counter options.

Genital herpes

A 2000 multicenter trial of 90 adults with recurrent genital HSV-2 compared a Canadian propolis ointment with acyclovir ointment and placebo. By day 10, 24 of 30 in the propolis group had healed, compared with 14 of 30 on acyclovir and 12 of 30 on placebo. It is a single small, single-blind study, and genital herpes should be diagnosed and managed with a clinician, who can offer proven oral antivirals.

Sore Throat and Colds

Propolis throat sprays are hugely popular in Europe and increasingly in the U.S. The best trial behind them is a 2021 randomized, double-blind, placebo-controlled study in 122 adults with mild, uncomplicated upper respiratory infections. Participants used an oral spray of a poplar-type propolis extract with a standardized polyphenol content (15 mg/mL), 2–4 sprays three times a day (12–24 mg of polyphenols a day) for five days.

  • After 3 days, 83% of the propolis group had no remaining symptoms, while 72% of the placebo group still had at least one.
  • By day 5, everyone in both groups had recovered, so the benefit was finishing about two days sooner.
  • No adverse reactions were linked to the spray.

That is a meaningful result for a self-limiting illness, but it is one trial of one standardized product in healthy adults. It does not show that propolis prevents colds, treats strep throat or works in children. Some pediatric “propolis” trials tested combination products (propolis with honey, zinc and Pelargonium), so the effect of propolis alone can’t be separated.

Rare but serious throat reactions: case reports describe laryngeal swelling and anaphylactic shock after propolis was used for a sore throat (Hsu 2004), and severe throat injury with mediastinitis after a woman took liquid propolis for a cold (Wu 2013). Stop immediately and seek care if a propolis spray or tincture causes throat swelling, trouble swallowing or breathing problems.

Blood Sugar, Cholesterol and Blood Pressure

Most propolis capsule research looks at cardiometabolic markers, often in people with type 2 diabetes. Two recent GRADE-assessed meta-analyses summarize it:

MarkerAverage change vs controlSource
Fasting blood glucose−9.75 mg/dLAdeli 2024 (21 RCTs)
HbA1c−0.46 percentage pointsAdeli 2024
Insulin resistance (HOMA-IR)−0.54Adeli 2024
ALT / AST (liver enzymes)−2.60 / −2.07 IU/LAdeli 2024
LDL cholesterol−9.31 mg/dLBahari 2025
Triglycerides−10.44 mg/dLBahari 2025
HDL cholesterol+2.03 mg/dLBahari 2025
Systolic blood pressure−2.24 mmHg (no change in diastolic)Bahari 2025

These are real but small average effects drawn from short trials that used different propolis types and doses, and both review teams called for larger, higher-quality studies. For context, an HbA1c drop of about 0.5 points is in the range of a mild add-on, not a substitute for metformin or other diabetes medicines. If you have diabetes, tell your doctor before adding propolis, because any glucose-lowering supplement can add to the effect of your medicines. Our berberine vs metformin page covers a supplement with a larger blood-sugar evidence base.

Mouth, Gums and Mucositis

Propolis toothpastes, gels and rinses are common. A 2026 meta-analysis of 45 randomized trials found propolis products reduced plaque scores and oral bacteria counts compared with inactive products and were not statistically different from chlorhexidine. But the authors rated the certainty of evidence as very low, and almost no trials measured actual cavities. A 2026 meta-analysis of seven trials in people receiving chemotherapy found lower odds of oral mucositis with propolis (odds ratio 0.35), with signs of possible publication bias.

Reasonable takeaway: a propolis toothpaste or rinse is a plausible add-on to brushing, flossing and fluoride, not a replacement. See our gum disease guide and mouthwash vs saltwater rinse comparison. People on chemotherapy should only use mouth products their oncology team approves.

What About Immunity and COVID-19?

“Immune support” is the most common propolis marketing claim and the least supported by outcome data. The clearest test came from Brazil. In a 2021 open-label trial of 124 hospitalized COVID-19 patients, adding green propolis (400 or 800 mg/day) shortened hospital stays (median 7 and 6 days vs 12 days). But in the larger double-blind, placebo-controlled BeeCovid2 trial of 188 patients taking 900 mg/day, length of stay was not significantly different (6.5 vs 7.7 days, p=0.22). The propolis group did have fewer secondary infections (6.1% vs 18.9%), a secondary finding that needs confirmation. Propolis is not a proven way to prevent or treat COVID-19, flu or other infections.

Safety: Allergy Is the Big Issue

Propolis is generally well tolerated in trials, but it is a recognized contact allergen, and allergic contact dermatitis (itchy, red, sometimes blistering rash), especially on the lips and around the mouth, is the most common reported side effect. Patch-test data show how common sensitivity can be:

  • The North American Contact Dermatitis Group found positive patch tests in 3.7% of patients tested with one Chinese propolis material in 2019, 14.7% with a Brazilian propolis material in 2020, and 2.2% with another Chinese material in 2021–2022 (DeKoven 2026).
  • In Amsterdam, 9.5% of 3,134 patients reacted to propolis in the European baseline series, but only 3% of those reactions were judged clinically relevant, and many people who reacted were also allergic to fragrances, balsam of Peru (Myroxylon pereirae) and colophony (Kocabas 2024).

The experts reviewing this data think many of these positive tests reflect cross-reactions in people already allergic to fragrances rather than true propolis allergy (de Groot 2026). Practically, though, if you have a fragrance, balsam of Peru, beeswax or bee-product allergy, or eczema on the lips, propolis is a poor choice. Do a small skin test before using a propolis lip cream, and stop if a rash develops.

Other risks to know

  • Severe allergic reactions: rare cases of throat swelling and anaphylaxis are described above. People with asthma or bee-sting allergy should be especially careful.
  • Kidney injury (rare): a 2005 case report described acute kidney failure needing dialysis in a man taking Brazilian propolis; kidney function recovered when he stopped, worsened when he restarted, and recovered again (Li 2005).
  • Pregnancy and breastfeeding: there is no good safety data. Supplements are not required to be tested in breastfeeding women before sale (NIH LactMed).
  • Babies: many propolis products for kids also contain honey. The CDC says not to give honey or honey-containing products to children younger than 1 year because of infant botulism risk.
  • Product quality: as a dietary supplement, propolis is not FDA-approved to treat any disease, and the FDA does not review supplements for safety or effectiveness before they are sold. Tinctures may also contain a lot of alcohol.

If You Want to Try It: A Safer-Use Checklist

  • Match the product to the evidence. For cold sores, the tested formula was a 0.5% propolis extract cream applied five times a day starting early. For sore throat, the tested spray listed its polyphenol content.
  • Look for standardization (a stated polyphenol or flavonoid content) and third-party testing rather than a vague “propolis blend.”
  • Patch-test first on the inner forearm for topical products, especially if you have sensitive skin or fragrance allergies.
  • Don’t replace treatment. Propolis is not a substitute for antivirals for frequent herpes outbreaks, antibiotics for strep throat, or diabetes and cholesterol medicines.
  • Tell your doctor or pharmacist what you are taking, especially before surgery or if you have diabetes, kidney disease or asthma.

Who Should Choose What

  • You get occasional cold sores: a 0.5% propolis lip cream is a reasonable, evidence-backed over-the-counter option alongside docosanol (Abreva). Frequent or severe outbreaks warrant a prescription antiviral.
  • You have a mild sore throat with a cold: a standardized propolis spray may shorten symptoms by a day or two. See a doctor for high fever, a very painful throat without cough, or symptoms lasting more than a week.
  • You want to lower blood sugar or cholesterol: propolis effects are small. Diet, exercise and proven medicines matter far more; talk to your doctor before adding it.
  • You want “immune support”: evidence for preventing infections is weak. Sleep, vaccination and a balanced diet are better bets.
  • Skip propolis if you are allergic to bees, bee products, balsam of Peru, fragrances or poplar, or if you are pregnant, breastfeeding or shopping for a baby under 1 year old.

Frequently Asked Questions

What is propolis good for?

The best human evidence is for cold sores: two randomized trials found a 0.5% propolis lip cream healed lesions about one day faster than 5% acyclovir cream. A placebo-controlled trial also found a standardized propolis throat spray shortened mild sore-throat symptoms. Effects on blood sugar and cholesterol are small.

Is propolis the same as honey?

No. Honey is made from flower nectar, while propolis is a sticky resin bees collect from tree buds and plants and mix with beeswax to seal the hive. Propolis contains plant compounds such as flavonoids and caffeic acid esters and is not eaten as a food the way honey is.

Does propolis boost the immune system?

Not in any proven way. Laboratory studies show antimicrobial activity, but human trials have not shown that propolis prevents colds or flu. In the largest placebo-controlled COVID-19 trial (188 patients), propolis did not significantly shorten hospital stays.

What are the side effects of propolis?

Allergy is the main one. Propolis can cause allergic contact dermatitis, especially on the lips, and rare cases of throat swelling and anaphylaxis have been reported. North American patch-test clinics found positive reactions in about 2 to 15 percent of tested patients, depending on the propolis material used.

Who should not take propolis?

Avoid propolis if you are allergic to bees or bee products, balsam of Peru, fragrances or poplar, and use caution if you have asthma or eczema. There is no good safety data for pregnancy or breastfeeding, and propolis products that contain honey should not be given to babies under 1 year old.

Does propolis lower blood sugar?

Slightly. A 2024 meta-analysis of 21 randomized trials found propolis lowered fasting blood glucose by about 9.75 mg/dL and HbA1c by about 0.46 percentage points. That is far less than diabetes medicines, so talk with your doctor before adding it.

Is propolis throat spray worth it?

It may help mild sore throats clear a little faster. In a 122-person trial, 83% of people using a standardized propolis spray were symptom-free after 3 days, while 72% of the placebo group still had at least one symptom. See a doctor for a severe sore throat, high fever or symptoms that last more than a week.

Sources

Medical disclaimer: This article is for educational purposes and does not replace medical advice. Consult a licensed healthcare provider before starting any supplement, medication, or treatment — particularly if you are pregnant, breastfeeding, taking other medications, or have a diagnosed medical condition.