Tier 4 — mechanistic

Low-Dose Fisetin Supplementation and Its Association With Chronic Inflammation in Middle-Aged and Older Adults: Study Protocol for a Triple-Blind, Randomised, Placebo-Controlled Trial

Juliette Tavenier, Magnus Berglind, Line Fleischer Hach, Louise Westberg Strejby Christensen, Maria Jana Masarikova, Rafal Yahya, Mette Bendtz Lindstrøm, Baker Nawfal Jawad, Anna Zatkova, Rikke Lundsgaard Nielsen, Helle Gybel Juul-Larsen, Thomas Kallemose, Jan Olof Nehlin, Morten Baltzer Houlind, Ove Andersen, Line Jee Hartmann Rasmussen
Basic & Clinical Pharmacology & Toxicology 2026 139(3):e70290

Bibliography

PubMed
PMID 42633989
PubMed Central
PMC13500367
Trial registry
View on ClinicalTrials.gov Registered trial — results not yet published in a peer-reviewed journal.
Funding
Investigator-initiated research supported by the Department of Clinical Research at Copenhagen University Hospital Amager and Hvidovre and listed research foundations/grants. The paper reports no investigator personal financial interest in fisetin.
Competing interests
No investigator personal financial interest in fisetin was reported. Ove Andersen disclosed patents involving the prognostic biomarker suPAR licensed to ViroGates; ViroGates was not involved in the study. Morten Baltzer Houlind disclosed an editorial-board role without involvement in manuscript handling.

Study snapshot

DesignSingle-center, investigator-initiated, triple-blind, randomized, placebo-controlled, parallel-group clinical trial protocol.
ModelGenerally healthy middle-aged and older adults aged 50 years or older.
SamplePlanned n=120 treated participants, allocated 1:1.
InterventionFisetin 100 mg orally once daily for 7 weeks versus matched placebo.
Duration7 weeks, with in-person visits at baseline, week 3 and week 7 plus interim safety/compliance monitoring.
EndpointsPrimary: change in plasma suPAR; Secondary: adverse-event occurrence and severity; Inflammation and cellular-senescence biomarkers; Epigenetic age; Frailty and physical function; Cognitive function; Quality of life

What the study showed, in plain terms

Fisetin LOW is designed to test a very different strategy from the intermittent high-dose senolytic protocols used in many aging trials. Participants aged 50 or older receive 100 mg of fisetin every day for seven weeks or placebo.

The primary question is whether low-dose daily fisetin changes suPAR, a marker of chronic systemic inflammation. The trial also tracks safety, senescence-related biomarkers, physical and cognitive function, epigenetic aging and quality of life. This publication is a protocol, so it should not be cited as evidence that those outcomes improve.

Key findings

  • Planned sample size is 120 participants aged 50 years or older, randomized 1:1 to fisetin or placebo.
  • The intervention is 100 mg/day for seven weeks, with suPAR change as the primary efficacy biomarker.
  • The protocol is triple-blind and includes broad exploratory measures of inflammation, senescence, frailty, cognition and biological aging.

What this study can and cannot tell us

  • Protocol only: no outcome data are reported, so no conclusion about benefit or harm can yet be drawn.
  • The planned 100 mg/day continuous schedule tests a different exposure strategy from high-dose intermittent senolytic regimens.
  • The primary endpoint is a biomarker rather than a hard clinical outcome.

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