Summary
This narrative review synthesises human evidence on the bioavailability of hydroxytyrosol (HT), a phenolic compound abundant in olives and extra virgin olive oil, with particular attention to how its chemical form and delivery vehicle influence its metabolic fate. The authors examine how free HT in supplements differs pharmacokinetically from the secoiridoid-bound forms present in whole-food matrices, and assess optimisation approaches such as encapsulation and emulsion-based delivery systems. The review is positioned within the regulatory context of the EFSA health claim, which currently restricts recognition of HT's LDL-protective effects to consumption within extra virgin olive oil rather than isolated supplement forms.
UK applicability
Whilst the review is not UK-specific, its findings are directly relevant to UK supplement regulation and the work of the Food Standards Agency in evaluating novel health claims for polyphenol-based products. UK consumers and manufacturers of olive polyphenol supplements would benefit from the formulation guidance outlined, particularly given post-Brexit divergence from EFSA regulatory frameworks.
Key measures
Bioavailability parameters (absorption, Cmax, urinary excretion of metabolites); ADME profiles; influence of food matrix (free HT vs secoiridoid-bound forms); formulation strategies (encapsulation, emulsification, nanoparticle delivery)
Outcomes reported
The review examines factors affecting the absorption, distribution, metabolism, and excretion of hydroxytyrosol from dietary supplements and food matrices, and evaluates formulation and delivery strategies aimed at optimising its bioavailability in humans.
Topic tags
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