The Science of Honey: Health Claims, Risks, and Properties
Honey, a natural product with a history of human consumption and diverse applications, is composed primarily of sugars and water, alongside trace elements. Scientific research has investigated various health claims associated with honey.
Evidence supports its use in wound healing and alleviating coughs, particularly in children. However, the evidence is limited or inconclusive for other areas, such as adult sleep improvement and certain chronic diseases.
Potential risks, including "mad honey" and botulism spores, necessitate specific contraindications and precautions for its use.
Composition and Basic Properties
Honey typically consists of up to 20% water, with the remaining 80% primarily composed of simple sugars. These include fructose (32-28%) and glucose (26-31%), and smaller amounts of sucrose.
These sugars can increase blood sugar levels, with the glycemic index (GI) of Australian honeys reported to range from 35 (low) to 72 (high). Honey also contains trace amounts of vitamins (A, B1, B2, B6, C), minerals (potassium, magnesium, iron, zinc), amino acids, and enzymes.
The specific nutrient profile can vary based on the pollen source, harvest time, and storage duration. Honey's acidity, density, and osmotic pressure contribute to its ability to inhibit bacterial growth. It also contains compounds with anti-inflammatory and antioxidant properties. The low water content makes it an environment where most bacteria cannot survive, contributing to its long shelf life.
Antimicrobial Action and Wound Healing
Honey possesses antimicrobial properties, partly due to components like hydrogen peroxide. A 2024 study co-authored by Dr. Kenya Fernandes from the University of Sydney demonstrated that numerous Australian honey samples maintained some antimicrobial properties after 15 to 17 years of storage.
Manuka honeys, in particular, contain methylglyoxal, a compound known for its antibacterial properties, along with other proteins and peptides. Research by Dr. Fernandes also indicated that honey from bees collecting nectar from diverse Australian native plants (excluding manuka) exhibited stronger antimicrobial effects than single-source honey. However, scientists currently lack consistent tools to predict which honeys will be highly effective against bacteria.
In medical applications, a 2015 Cochrane review found high-quality evidence that honey dressings healed second-degree burns 4–5 days faster than conventional dressings. Moderate-quality evidence suggested that post-surgical infected wounds healed more rapidly with honey. A 2020 review indicated that Manuka and medical-grade honeys were effective against various multi-drug resistant bacterial species, supporting their potential use in infections with antibiotic resistance.
For wound care, only sterilized medical-grade honey, processed for safety and antibacterial standards, should be used under medical guidance.
Professor Deshan Sebaratnam, a dermatologist, noted that while some studies suggest honey might be superior to conventional antiseptics, the quality of these studies is often low. The widespread use of honey in healthcare remains limited, and standardizing non-manuka honeys for clinical use is challenging due to varying active compound mixtures.
Honey is not considered a solution to the global antibiotic resistance crisis. Evidence supports its use as an antiseptic (applied externally), but not as an antibiotic (acting internally). Professor Liz Harry emphasized that ingesting honey as an antibiotic is inappropriate because it does not enter the bloodstream to target specific areas of infection. Manuka honey is not considered superior to other honeys for internal consumption.
Effects on Sleep and Coughs
Research on honey's effect on adult sleep is limited. One trial involving 68 hospitalized adults reported improved sleep quality after three days in a group consuming a milk and honey mixture twice daily, though potential participant bias was noted.
For children with upper respiratory tract infections, five studies linked honey mixtures to improved sleep and reduced cough severity compared to cough medicines or no medication.
These findings require cautious interpretation due to variations in honey type and quantity used across studies, and it is also noted that such coughs often resolve without treatment. Chemical analysis of some honey varieties detected serotonin and melatonin, but the small amounts are believed to affect bees more significantly than humans.
Impact on Chronic Diseases and Gut Health
Diabetes
A 2023 review of 48 clinical trials suggested that honey had positive effects on diabetes risk factors, including glucose tolerance and wound healing. Due to non-standardized doses and types, it was concluded that honey should supplement, not replace, regular medications.
Heart Disease
A 2022 analysis found no effect of honey on total cholesterol, triglycerides, low-density lipoprotein (LDL) cholesterol, or high-density lipoprotein (HDL) cholesterol. Conversely, a 2025 meta-analysis on propolis (bee glue) reported significant reductions in triglycerides, LDL cholesterol, fasting blood sugars, insulin, and systolic blood pressure. Propolis supplement trials are often short-term and can be expensive.
Cancer Care
A 2023 review indicated honey alleviated mouth ulceration and inflammation post-chemotherapy or radiotherapy in cancer patients, and reduced some chemotherapy-related toxic effects.
Gut Health
Honey contains indigestible carbohydrates (oligosaccharides) that act as prebiotics, fostering beneficial gut bacteria. Despite potential gut microbiome effects, its high sugar content means it may not be primarily marketed for gut health.
Risks and Contraindications
"Mad Honey"
Certain honeys, known as "mad honey," are derived from Rhododendron plant nectar and contain grayanotoxins. These compounds can cause pharmacological and toxic effects, including nausea, dizziness, low blood pressure, severe bradycardia (slow heart rate), neurological complications, and potentially life-threatening cardiac arrhythmia.
The import and sale of "mad honey" are illegal in Australia, though it has historical medicinal and psychoactive uses in Nepal and Turkey.
Botulism
Commercial honey is pasteurized, but this process does not eliminate Clostridium botulinum spores, which can cause botulism. Therefore, honey should not be consumed by infants under one year of age or individuals with compromised immune systems. Raw honey can also contain these bacterial spores, making it unsuitable for infants under 12 months.