The effects of honey on the immune system

honey-immune-system-scientific-review

Honey has long been recognised for its potential to support the immune system, making it one of the most valued natural substances throughout history. Produced by honeybees (Apis mellifera), honey has been utilised as a natural remedy since ancient times, with documented medicinal applications dating back thousands of years across numerous civilisations. In recent years, scientific research has increasingly focused on elucidating the therapeutic properties of honey, particularly its effects on the immune system.

Honey contains a complex mixture of over 200 substances, including sugars, proteins, enzymes, amino acids, minerals, vitamins, and bioactive compounds such as flavonoids and polyphenols. These components contribute to honey’s multifaceted biological activities, including antioxidant, anti-inflammatory, and antimicrobial properties.

This narrative literature review critically evaluates current scientific evidence regarding honey’s role in immunomodulation through analysis of clinical trials, mechanistic studies, and systematic reviews, providing evidence-based insights into its potential applications in enhancing immune function and treating immune-related disorders.

Introduction

The search for natural immunomodulatory agents has intensified in recent years, driven by growing concerns about antibiotic resistance and the desire for complementary therapeutic approaches. Honey – including medical-grade varieties such as Manuka honey and others – has emerged as a promising candidate for immune system enhancement, with clinical evidence continuing to accumulate supporting its immunomodulatory properties through rigorous scientific investigation.

Approach and limitations

Methodology. This narrative review synthesises current evidence on honey’s immunomodulatory properties through targeted literature searches focusing on high-quality clinical trials, systematic reviews, and mechanistic studies published in peer-reviewed journals.

Studies were selected based on relevance to immune function, clinical significance, and methodological quality.

Limitations. As a narrative review rather than a systematic analysis, study selection reflects the author’s interpretation of available literature and should be considered alongside other sources of evidence when making clinical or research decisions.

Summary of available evidence

The following sections summarise key themes and findings from the literature on honey’s immunomodulatory effects, organised by immune system components and clinical applications.

Immune system effects

Innate immunity enhancement. Multiple published studies demonstrate honey’s ability to enhance innate immune responses. Tonks et al. (2003) showed honey stimulates inflammatory cytokine production from monocytes, while Majtan (2014) reviewed evidence for honey enhancing phagocytic activity of immune cells and stimulating antimicrobial peptide production.

Adaptive immunity modulation. Research indicates honey can influence adaptive immune responses. Masad et al. (2021) reviewed evidence showing honey affects T-lymphocyte function and antibody production, with particular effects on cytokine profiles that may promote anti-inflammatory responses whilst maintaining protective immunity.

Clinical applications

Respiratory infections. Several studies support honey’s efficacy in respiratory conditions. The comprehensive review by Palma-Morales et al. (2023) analysed 48 clinical trials and found predominantly beneficial effects of honey intake on various health parameters, including respiratory symptoms. Multiple studies have specifically demonstrated honey’s effectiveness in reducing cough frequency and duration.

Immune supportive care. Clinical evidence supports honey’s role in cancer therapy. The Phase III randomised controlled trial by Batbold et al. (2017) involving 269 tuberculosis patients demonstrated significant improvements in treatment outcomes, with 65.9% of honey recipients achieving sputum clearance compared to 25.2% in controls (p<0.0001). Additional studies have shown honey’s effectiveness in reducing radiotherapy-induced mucositis.

Wound healing. Systematic reviews support medical-grade honey’s effectiveness in wound care. Barazesh et al. (2025) provided a comprehensive review concluding that medical-grade honey accelerates healing and reduces infection rates. Multiple clinical trials have demonstrated superior outcomes compared to conventional wound treatments.

Mechanistic understanding

Antioxidant activity. Studies consistently demonstrate honey’s potent antioxidant properties, which correlate with phenolic compound content. This antioxidant activity contributes to cellular protection and immune system support.

Anti-inflammatory mechanisms. Research shows honey modulates inflammatory pathways, including effects on NF-κB signalling and cytokine production, contributing to its therapeutic effects in inflammatory conditions.

Safety considerations

Clinical studies consistently report excellent safety profiles for honey. The safety study by Stephens et al. (2010) confirmed no significant immunological adverse effects with Manuka honey consumption in healthy individuals. Most adverse events reported across studies are mild gastrointestinal symptoms in sensitive individuals.

Discussion

Interpretation of available evidence

This narrative review synthesises available literature demonstrating honey’s immunomodulatory properties and clinical applications. Based on the studies examined, there appears to be consistent evidence supporting honey’s beneficial effects on immune function, though the strength of this evidence varies across different applications and study designs.

Clinical relevance and applications

The evidence suggests several promising clinical applications for honey:

  • respiratory conditions. Multiple studies support honey’s effectiveness in managing respiratory symptoms, particularly cough. This appears to be one of the better-established applications, with evidence from various clinical trials and the comprehensive analysis by Palma-Morales et al. (2023);
  • immune supportive care. The Phase III tuberculosis trial by Batbold et al. (2017) provides particularly robust evidence for honey’s potential in supporting immune function during challenging medical treatments. Similar principles may apply to other therapies;
  • wound care. Medical-grade honey appears to have strong evidence for wound healing applications, supported by systematic reviews and clinical trials. The evidence suggests benefits in terms of healing time and infection prevention.

Mechanisms and scientific understanding

The mechanistic evidence suggests honey works through multiple pathways:

  • antioxidant effects that may protect immune cells;
  • anti-inflammatory properties that could modulate excessive immune responses;
  • direct effects on immune cell function and activity.

However, the precise mechanisms and their relative importance remain areas for further research.

Limitations of current evidence

Several important limitations should be acknowledged:

  • study heterogeneity. The studies reviewed vary significantly in terms of honey types used, dosing protocols, study populations, and outcome measures. This makes it difficult to draw definitive conclusions about optimal protocols;
  • quality variations. While some high-quality randomised controlled trials exist (such as the Batbold et al. tuberculosis study), many studies in this field have smaller sample sizes or less rigorous designs;
  • standardisation challenges. The lack of standardised – or at least well-characterised – honey preparations across studies presents challenges for clinical translation and reproducibility;
  • limited long-term data. Most studies have relatively short follow-up periods, limiting understanding of long-term effects and safety.

Future research needs

To better establish honey’s therapeutic role, future research should address:

  • standardisation — or at minimum, thorough characterisation including the quantification of bioactive compounds — of honey preparations for clinical use;
  • larger, well-designed clinical trials with standardised protocols;
  • better understanding of optimal dosing and treatment durations;
  • long-term effects;
  • economic evaluations of honey-based interventions.

Composition of honey and bioactive constituents

Honey is primarily composed of carbohydrates (75-80%), predominantly fructose and glucose, with water constituting approximately 15-17% of its composition. The remaining fraction consists of proteins, amino acids, enzymes, organic acids, vitamins, minerals, and phenolic compounds (or polyphenols). The precise composition varies depending on botanical origin, geographical location, seasonal and environmental factors, and processing methods.

The bioactive constituents in honey, particularly flavonoids and phenolic compounds, are believed to be responsible for many of its health-promoting effects. These compounds include phenolic acids (gallic, caffeic, p-coumaric, and ferulic acids) and flavonoids (quercetin, kaempferol, luteolin, apigenin, chrysin, and galangin). The total phenolic content in different honey varieties ranges from 0.65 to 84.17 mg/100 g, with darker honeys generally containing higher concentrations of these compounds (Palma-Morales et al., 2023).

These bioactive molecules function as powerful antioxidants and possess anti-inflammatory properties that contribute significantly to honey’s immunomodulatory effects (Ranneh et al., 2021).

Mechanisms of immunomodulation by honey

Honey exerts its effects on the immune system through multiple mechanisms:

  • one primary pathway involves the antioxidant activity of honey’s phenolic compounds, which neutralise reactive oxygen species (ROS) and reduce oxidative stress. Oxidative stress plays a crucial role in immune dysfunction and the pathogenesis of various diseases. By mitigating oxidative damage, honey helps maintain proper immune cell function and prevents immunosenescence;
  • additionally, honey demonstrates potent anti-inflammatory properties by inhibiting the production of pro-inflammatory cytokines and mediators. Research indicates that honey can modulate the nuclear factor-kappa B (NF-κB) signalling pathway, a key regulator of inflammatory responses (Samarghandian et al., 2017);
  • honey’s immunomodulatory effects also include enhancing the proliferation and activation of B and T lymphocytes, increasing phagocytic activity of macrophages, and stimulating the release of cytokines such as tumour necrosis factor-alpha (TNF-α), interleukin-1 (IL-1), and interleukin-6 (IL-6) (Majtan, 2014).

These mechanisms collectively contribute to honey’s ability to enhance both innate and adaptive immune responses.

Honey’s effects on innate immunity

The innate immune system represents the first line of defence against pathogens and comprises physical barriers, antimicrobial peptides, complement proteins, and cellular components including neutrophils, macrophages, and natural killer cells. Honey has been shown to enhance several aspects of innate immunity, by:

  • increasing the phagocytic activity of macrophages and neutrophils, thereby improving their ability to engulf and eliminate pathogens. This enhanced phagocytosis is attributed to the flavonoids present in honey, which can modulate cellular signalling pathways involved in immune cell activation (Tonks et al., 2003);
  • stimulating the production of antimicrobial peptides, such as defensins and cathelicidins, which play crucial roles in host defence against bacteria, viruses, and fungi;
  • furthermore, honey enhances the cytotoxic activity of natural killer cells, important for eliminating virus-infected cells and cancer cells.

The immunomodulatory effects of honey on innate immunity are particularly relevant for preventing and managing infectious diseases and may explain its traditional use in treating respiratory and gastrointestinal infections.

Honey’s impact on adaptive immunity

Adaptive immunity involves highly specific responses mediated by T and B lymphocytes, resulting in immunological memory. Honey has been demonstrated to influence various aspects of adaptive immune responses. Research indicates that honey and its bioactive components can:

  • enhance T lymphocyte proliferation and modulate the balance between different T cell subsets, including helper T cells (Th1, Th2, Th17) and regulatory T cells. This modulation is crucial for maintaining immune homeostasis and preventing autoimmune and allergic disorders. Honey also affects B lymphocyte function, enhancing antibody production and promoting humoral immunity;
  • the flavonoids in honey, particularly quercetin and kaempferol, have been shown to regulate cytokine production by T cells, influencing the direction of immune responses (Masad et al., 2021);
  • additionally, honey’s ability to modulate dendritic cell function affects antigen presentation and subsequent T cell activation, further influencing adaptive immunity.

These effects on adaptive immune responses suggest potential therapeutic applications for honey in several clinical contexts, such as vaccine adjuvant applications and immune-mediated disease management. The balanced immunomodulation observed with honey intervention shows promise for managing various immune-mediated conditions, including:

  • autoimmune disorders. Rheumatoid arthritis, multiple sclerosis, and inflammatory bowel disease, where honey’s regulatory T-cell enhancement may help restore immune tolerance;
  • allergic conditions. Asthma, allergic rhinitis, and atopic dermatitis, leveraging honey’s ability to modulate Th1/Th2 balance and reduce excessive inflammatory responses;
  • chronic inflammatory diseases. Psoriasis, systemic lupus erythematosus, and Crohn’s disease, where honey’s anti-inflammatory cytokine profile modulation may provide therapeutic benefit;
  • transplant immunology. Potential application in organ transplantation protocols to enhance graft tolerance whilst maintaining protective immunity against infections.

These applications warrant further clinical investigation through targeted randomised controlled trials in specific patient populations.

Clinical evidence for honey’s immunomodulatory effects

Respiratory infections and upper respiratory tract conditions

Numerous clinical studies have investigated honey’s effects on immune-related conditions, providing evidence for its therapeutic potential. In respiratory infections, honey has demonstrated efficacy in alleviating symptoms and reducing illness duration, particularly in upper respiratory tract infections and cough in children.

A comprehensive review analysing 48 clinical trials with 3,655 subjects found more beneficial than negative effects of honey intake on various health parameters, including immune function (Palma-Morales et al., 2023). Honey has shown promise in managing allergic conditions, with studies indicating that local honey consumption may reduce allergic symptoms through desensitisation mechanisms.

Cancer therapy and immunomodulation

In cancer therapy, honey exhibits immunomodulatory properties that may enhance anti-tumour immune responses whilst mitigating treatment-related immunosuppression. Clinical trials have demonstrated honey’s efficacy in reducing mucositis caused by chemo-radiotherapy, suggesting protective effects on mucosal immunity (McLoone et al., 2016).

A randomised controlled trial on 78 head and neck cancer patients receiving concurrent chemoradiation found that honey significantly reduced the severity of mucositis-associated pain and resulted in fewer treatment gaps and decreased overall radiotherapy treatment duration (Rashad et al., 2009).

Wound healing and local immune responses

Honey’s application in wound management leverages both its direct antimicrobial properties and its ability to stimulate local immune responses, enhancing healing processes. Medical-grade honey has demonstrated superior efficacy in clinical trials, with a systematic review of 30 randomised controlled trials concluding that topical use of medical-grade honey decreased wound healing time and was cost-effective (Barazesh et al., 2025).

Large-scale clinical validation

A particularly significant Phase III randomised controlled trial involving 269 patients with pulmonary tuberculosis demonstrated that honey-based immunotherapy (Immunoxel) significantly enhanced sputum clearance and reduced inflammation markers. After one month, 65.9% of honey recipients became sputum smear negative compared to 25.2% in the placebo group (p < 0.0001) (Batbold et al., 2016).

While these clinical findings are promising, many studies have methodological limitations, including small sample sizes, lack of standardisation in honey types used, and variability in dosing regimens, necessitating further robust clinical investigations.

Honey as an adjuvant therapy

Emerging evidence suggests honey’s potential as an adjuvant to conventional therapeutic approaches. In combination with antibiotics, honey has demonstrated synergistic effects, enhancing antimicrobial efficacy whilst potentially reducing the development of resistance. This synergism is attributed to honey’s multiple mechanisms of action against microorganisms, including osmotic effects, hydrogen peroxide production, and the presence of antimicrobial compounds such as methylglyoxal.

In cancer treatment, honey may serve as a valuable adjuvant by enhancing the efficacy of chemotherapeutic agents whilst mitigating their immune-suppressive side effects. Studies have shown that honey can enhance the effects of drugs such as 5-fluorouracil and paclitaxel against various cancer cell lines (Masad et al., 2021).

Additionally, honey’s anti-inflammatory properties make it a potential adjunct in managing chronic inflammatory conditions, including inflammatory bowel disease and rheumatoid arthritis. The immunomodulatory effects of honey, particularly its ability to balance pro-inflammatory and anti-inflammatory responses, contribute to its potential as an adjuvant therapy.

Importantly, honey represents a safe adjuvant to be administered alongside drugs for certain diseases, offering a natural approach to enhancing treatment outcomes whilst minimising adverse effects.

Factors affecting honey’s immunomodulatory properties

The immunomodulatory effects of honey vary considerably depending on several factors. Botanical origin significantly influences honey’s composition and, consequently, its biological activities. Manuka honey, derived from the nectar of Leptospermum scoparium, contains high levels of methylglyoxal and exhibits particularly potent antimicrobial and immunomodulatory properties.

Similarly, Tualang, Gelam, and buckwheat honeys have demonstrated strong antioxidant and anti-inflammatory activities due to their rich phenolic content. Geographical location affects the floral sources available to bees and environmental conditions, further influencing honey composition.

Additionally, the dose and duration of honey consumption influence its effects on the immune system, with optimal parameters varying depending on the specific health condition being addressed. A safety study demonstrated that consumption of Manuka honey UMF® 20+ for four weeks did not significantly alter total IgE levels in healthy individuals, confirming its safety profile (Stephens et al., 2010).

Understanding these factors is essential for standardising honey preparations for clinical applications and ensuring consistent therapeutic outcomes.

Safety considerations and potential adverse effects

Whilst honey is generally recognised as safe for consumption, several important safety considerations exist:

  • honey should not be administered to infants under 12 months due to the risk of botulism, as honey may contain Clostridium botulinum spores that can germinate in the immature intestinal tract;
  • individuals with diabetes should consume honey with caution due to its high sugar content, although some studies suggest that honey may have a lower glycaemic impact compared to refined sugars;
  • allergic reactions to honey, whilst rare, can occur in sensitive individuals, particularly those with pollen allergies. These reactions range from mild (oral allergy syndrome) to severe (anaphylaxis);
  • furthermore, the quality and purity of honey are important considerations, as adulterated or contaminated honey may contain pesticides, antibiotics, or heavy metals that could potentially harm health rather than improve it.

Despite these considerations, honey demonstrates an excellent safety profile when used appropriately, with minimal adverse effects reported in clinical studies, making it a valuable natural option for immune support.

Future directions and research needs

Despite the growing body of evidence supporting honey’s immunomodulatory properties, several research gaps remain. Future studies should focus on elucidating the precise molecular mechanisms underlying honey’s effects on specific immune cell populations and signalling pathways.

Standardisation or characterization of honey preparations for clinical use represents another critical area for development, as the variability in honey composition presents challenges for characterising consistent therapeutic applications. Large-scale, well-designed clinical trials are needed to establish optimal dosing regimens, treatment durations, and specific honey types for various immune-related conditions.

Investigating potential interactions between honey and conventional medications, particularly immunomodulatory drugs, will be essential for safe clinical implementation. Additionally, research into novel delivery systems for honey and its bioactive components could enhance bioavailability and targeted action.

Exploring the potential of specific honey fractions or isolated bioactive compounds may lead to the development of standardised therapeutic agents with enhanced efficacy. As interest in natural and complementary approaches to immune health continues to grow, addressing these research needs will be crucial for establishing honey as a legitimate therapeutic option in modern healthcare.

Limitations

Several limitations should be acknowledged in this review and the current body of evidence:

Methodological limitations

Study heterogeneity. The included studies exhibit considerable heterogeneity in terms of study design, participant populations, honey types used, dosing regimens, and outcome measures. This heterogeneity limits the ability to perform quantitative meta-analyses and may affect the generalisability of findings.

Sample sizes. Many clinical trials investigating honey’s immunomodulatory effects have relatively small sample sizes, which may limit statistical power and the ability to detect clinically meaningful differences.

Standardisation challenges. The lack of standardised honey preparations – or, at least, their specific characterization – across studies presents significant challenges for reproducibility and clinical translation. Variation in honey composition due to botanical origin, geographical factors, and processing methods introduces confounding variables.

Evidence limitations

Publication bias. There may be a bias towards publishing positive results, potentially overestimating honey’s beneficial effects whilst underreporting neutral or negative findings.

Duration of follow-up. Many studies have relatively short follow-up periods, limiting understanding of long-term effects and safety profiles.

Mechanistic gaps. Whilst multiple mechanisms have been proposed for honey’s immunomodulatory effects, the precise molecular pathways and their relative contributions remain incompletely understood.

Clinical translation challenges

Regulatory considerations. The classification of honey as a food product rather than a pharmaceutical agent presents regulatory challenges for standardised clinical applications.

Dosing protocols. Optimal dosing regimens for different clinical conditions and patient populations remain to be established through rigorous dose-finding studies.

Drug interactions. Limited data exist regarding potential interactions between honey and conventional immunomodulatory medications.

Interim conclusions

Honey is a promising natural agent for enhancing immune function and managing immune-related disorders. Its complex composition — rich in bioactive compounds such as flavonoids and phenolic acids — underpins its antioxidant, anti-inflammatory, and immunomodulatory effects on both innate and adaptive immunity.

The evidence reviewed supports honey’s role in strengthening immune responses to infections, modulating inflammation, and potentially acting as an adjuvant in cancer therapy. Clinical validation, including large-scale randomised controlled trials like the Phase III tuberculosis study, further reinforces its therapeutic potential.

Further research is essential to elucidate honey’s mechanisms of action, optimise its formulations, and develop evidence-based clinical protocols. As a safe, accessible, and traditionally used natural product, honey represents a valuable complement to conventional strategies for supporting immune health and improving outcomes across diverse populations.

Dario Dongo

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