I monofloral honeys represent a complex biological matrix whose nutraceutical value is strictly linked to thebotanical origin. A recent scientific review published on Dietetics (Martinotti et al., 2026) defines this as a ‘functional interactome’, that is a dynamic network of interactions among its components, gastrointestinal physiology, microbiota and cell signaling pathways.
Comparative mapping of varieties
The research adopts a structured narrative methodology, with systematic querying of PubMed, Web of Science, Scopus and ScienceDirect databases up to May 2026, combining Boolean operators and specific keywords (bioaccessibility, bioavailability, Nrf2, GPR35, NF-κB, microbiota, adulteration).
Peer-reviewed studies on biochemistry, digestion have been included in vitro, cell cultures and animal models in vivo, mapping and comparatively analyzing four representative honeys: chestnut, acacia, argan and Manuka.
Phytochemical identity of four monofloral honeys
Researchers from Universities of Eastern Piedmont (Alessandria, Italy) and Cadi Ayyad (Marrakech, Morocco) analyzed the scientific literature relating to two honeys common in Italian and European production (chestnut and acacia), one honey typical of southwestern Morocco (argan) and one typical of New Zealand (Manuka):
- honey of chestnut (Castanea sativa) , high conductivity, is distinguished by thequinurenic acid, marker derived from tryptophan that acts as an antagonist of the NMDA receptor and agonist of the GPR35 receptor, with anti-inflammatory and neuroprotective properties. The authors specify however that such effects are demonstrated only for the isolated compound at high purity, leaving the extension to whole honey intake a preclinical hypothesis;
- the honey of acacia (Robinia pseudoacacia), although with low total phenolic content, concentrates selective flavones and flavonols (acacetin, quercetin, kaempferol) capable of inhibiting alpha-glucosidase and alpha-amylase; the high fructose/glucose ratio (> 1.45) explains its low glycemic index and the reduced postprandial insulin response, although glycemic index values remain subject to individual metabolic variability;
- the honey of argan (Argania spinosa), rare and confined to the UNESCO biosphere reserve of southwestern Morocco, presents marker sterols (schottenol, spinasterol) and antioxidant capacity in vitro; its bioactivity remains however limited to preliminary screenings, without clinical validation;
- the Manuka (Leptospermum scoparium) is defined by the post-harvest conversion of dihydroxyacetone into methylglyoxal (MGO), responsible for aantibacterial activity non-peroxide (NPA) heat-stable; commercial honeys present MGO between 100 and 500 mg/kg, while concentrations exceeding 800 mg/kg identify products medical-grade certified for wound care (Peters et al., 2025).
Digestive stability and bioavailability
The study rigorously distinguishes three physiological levels:
- bioaccessibility (fraction released from the matrix in the intestinal lumen);
- bioavailability (portion reaching the systemic circulation);
- bioactivity (final cellular effect).
In the gastrointestinal transit, the acidic environment of the stomach (pH 1.2–2.5) denatures enzymes secreted by bees, but the high sugar concentration exerts a protective effect of ‘protein crowding‘; in the duodenum (pH 6.8–7.5) bile salts mediate the micellar solubilization of lipophilic sterols, while in the colon the microbiota hydrolyzes flavonoid glycosides into absorbable aglycones and ferments prebiotic oligosaccharides into short-chain fatty acids (Schell et al., 2022; Seraglio et al., 2021).
Molecular pathways and cellular responses
Honey's activity is not attributable to a single active ingredient, but rather to thecoordinated action of multiple molecules on distinct receptors and signaling pathways cellular (Bonsignore et al., 2024). The review identifies distinct pathways:
- activation of the Nrf2 factor and induction of phase II antioxidant enzymes (SOD, CAT, GPx);
- suppression of the NF-κB pathway with reduction of pro-inflammatory cytokines (IL-6, IL-1β, TNF-α);
- kynurenine–GPR35 axis in chestnut;
- antimicrobial mechanism based on MGO (Manuka) or hydrogen peroxide generated by glucose oxidase (acacia and argan).
However, the authors place most of these effects at the preclinical level, distinguishing the degree of evidence for each function with a hierarchical table.
Climate change and compositional variations
Among the pressures threatening the integrity of monofloral honeys, the review identifies climate change as a factor capable of altering blooming phenology and, with it, the yield and phytochemical composition of nectar (Martinotti et al., 2026). Temperature and rainfall pattern variations in the most vulnerable areas—from the argan ecosystems in Morocco to the Manuka environments in Oceania—can modify the conversion of dihydroxyacetone into methylglyoxal or the concentration of acacia flavonoids, due to premature wilting of flowers of Robinia.
Added to this is the so-called ‘dilution effect’: the increase in atmospheric CO₂ reduces the protein and mineral content of pollen, with possible repercussions on the enzymatic secretion of bees. This results in a ‘phytochemical drift’ (phytochemical drift), whereby a honey formally compliant with the monofloral test may be impoverished in concentrations of bioactive compounds, with direct consequences on the functional consistency of the product.
Clinical evidence and development of functional ingredients
The functional potential of monofloral honeys opens concrete prospects for dietetics and nutraceuticalsThe consolidation of this evidence now requires the transition to clinical models on humans, supported by pharmacokinetic studies and omics platforms. This solid scientific basis is the necessary prerequisite to enhance individual varieties as value-added ingredients.
Our team of DO (Food and Agriculture Requirements) is at the disposal of sector companies, associations, and research consortia to design studies compliant with EFSA requirements (European Food Safety Authority) and to prepare scientific dossiers for the authorization of specific health claims, in line with Regulation (EC) No 1924/06.
Dario Dongo
Bibliography
Bonsignore, G., Martinotti, S., & Ranzato, E. (2024). Honey bioactive molecules: There is a world beyond the sugars. BioTech, 13(4), 47. https://doi.org/10.3390/biotech13040047
Regulation (EC) No 1924/2006 of the European Parliament and of the Council of 20 December 2006 on nutrition and health claims made on foods. Consolidated text: 13/12/2014 http://data.europa.eu/eli/reg/2006/1924/2014-12-13
Martinotti, S., Bonsignore, G., Lakouam, Z., El Abbassi, A., & Ranzato, E. (2026). Monofloral honeys as functional interactomes: Navigating bioavailability, gut microbiota transformation, and food integrity pressures. Dietetics, 5(3), 43. https://doi.org/10.3390/dietetics5030043
Peters, L. J. F., Majtan, J., Mossialos, D., Szweda, P., Mateescu, C., Ozturk, F., Wagener, F. A. D. T. G., & Cremers, N. A. J. (2025). Medical-grade honey: Its definition and refined standards. Journal of Wound Care, 34(6), 412–423. https://doi.org/10.12968/jowc.2024.0206
Schell, K. R., Fernandes, K. E., Shanahan, E., Wilson, I., Blair, S. E., Carter, D. A., & Cokcetin, N. N. (2022). The potential of honey as a prebiotic food to re-engineer the gut microbiome toward a healthy state. Frontiers in Nutrition, 9, 957932. https://doi.org/10.3389/fnut.2022.957932
Seraglio, S. K. T., Schulz, M., Gonzaga, L. V., Fett, R., & Costa, A. C. O. (2021). Current status of the gastrointestinal digestion effects on honey: A comprehensive review. Food Chemistry, 357, 129807. https://doi.org/10.1016/j.foodchem.2021.129807
Dario Dongo, lawyer and journalist, PhD in international food law, founder of WIISE (FARE - GIFT – Food Times) and Égalité.
