About Citrus Flavonoid
Hesperidin is the most abundant flavonoid in citrus fruits (peels, membranes). Converted to the active metabolite hesperetin by gut microbiota — bioavailability is poor (~5–9% urinary recovery) and highly dependent on individual gut microbiome composition. To address poor absorption: glucosyl hesperidin (alpha-glucosyl hesperidin) is a water-soluble derivative with significantly improved bioavailability, and micronized hesperidin offers a modest improvement over standard forms. Even with enhanced forms, individual response varies dramatically based on gut flora. Strongest signal: endothelial function (FMD) improvement in metabolic syndrome patients (Rizza 2011, JCEM), but the largest standalone FMD trial (Salden 2016, n=68) was negative on its primary endpoint. Meta-analyses on lipids contradict each other (2019: null; 2023: significant but with publication bias). Blood glucose/insulin meta-analyses are clearly negative. The well-established venous health evidence (chronic venous insufficiency, hemorrhoids) belongs to MPFF/Daflon (90% diosmin + 10% hesperidin) — diosmin is the dominant active in that combination, not hesperidin alone. ⚠️ May slow blood clotting — caution with anticoagulants, stop 2 weeks before surgery.
What Citrus Flavonoid supports
- May improve endothelial function (FMD) in people with metabolic syndrome — inconsistent across trials
- Most abundant citrus flavonoid with strong preclinical antioxidant and anti-inflammatory data
- Poor bioavailability (~5–9%) and effects vary dramatically by individual gut microbiome
How much Citrus Flavonoid to take
Clinical studies typically use 500–1000 mg of Citrus Flavonoid. Endothelial function trials used 292–500 mg/day for 3–6 weeks. Cardiometabolic trials used 500–1000 mg/day for 8–12+ weeks. Effects more likely at >500 mg/day and >12 weeks.
- Effective range
- 500–1000 mg
Clinical evidence
Limited clinical evidence. A few clinical trials with inconsistent results; poor bioavailability limits effectiveness
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