Fisetin: Why It's in Your HOP Box
The Most Powerful Natural Senolytic Yet Discovered
In a landmark 2018 screening study, researchers at Mayo Clinic tested 10 flavonoids for their ability to clear senescent "zombie" cells. Fisetin came out on top, outperforming all other compounds tested, including quercetin, curcumin, and resveratrol.
Senescent cells are old, damaged cells that refuse to undergo normal cell death. Instead, they secrete inflammatory molecules (known as the SASP, or senescence-associated secretory phenotype) that damage surrounding healthy tissue. This process is now recognized as one of the fundamental drivers of aging, contributing to joint pain, skin aging, cognitive decline, and chronic disease.
Fisetin is a flavonoid found naturally in strawberries, apples, and persimmons. In HOP Box, it is part of the Damage Control blend, working alongside quercetin, apigenin, curcumin, and astaxanthin to comprehensively target cellular damage.
What the Research Shows
Most potent natural senolytic
The study that put fisetin on the longevity map screened multiple flavonoids and found fisetin to be uniquely effective.
Key study: Researchers at Mayo Clinic and the University of Minnesota screened 10 flavonoids for senolytic activity and found that fisetin was the most potent natural senolytic identified, reducing senescence markers and extending health span and lifespan when administered to aged mice. This study is the foundation for ongoing human trials at Mayo Clinic.
Yousefzadeh MJ, Zhu Y, McGowan SJ, et al. "Fisetin is a senotherapeutic that extends health and lifespan." EBioMedicine. 2018;36:18-28.
First published RCT: Joint health and physical function
The first published randomized controlled trial of fisetin as a standalone senolytic showed meaningful results for osteoarthritis.
Key study: In 74 subjects (60% female, mean age 63) with knee osteoarthritis, fisetin was safe with no serious adverse effects over 12+ months. Notable improvements were observed in 4 key physical function tests after 6 months, suggesting that clearing senescent cells in joint tissue slowed cartilage degeneration.
"Results from a randomized clinical trial evaluating the senolytic fisetin for treating knee osteoarthritis." Osteoarthritis and Cartilage. 2025.
https://www.oarsijournal.com/article/S1063-4584(25)00692-2/abstract00692-2/abstract)
Neuroprotection and cognitive health
Fisetin crosses the blood-brain barrier, making it particularly relevant for protecting brain health with age.
Key study: Research has demonstrated that fisetin activates signaling pathways involved in memory consolidation (ERK/CREB) and has shown neuroprotective properties in multiple human cell studies and clinical investigations, with ongoing trials examining its effects on Alzheimer's disease and age-related cognitive decline.
Maher P. "How fisetin reduces the impact of age and disease on CNS function." Frontiers in Bioscience (Scholar Edition). 2015;7:58-82.
Ongoing Mayo Clinic human trials
Multiple human trials of fisetin are currently underway, targeting conditions from osteoarthritis to frailty to COVID-19 recovery. The AFFIRM trial (Alleviating Frailty, Inflammation, and Related Measures in Older Adults) is the largest senolytic trial in history.
ClinicalTrials.gov identifiers: NCT03675724 (AFFIRM-Lite), NCT03430037 (Fisetin in Knee OA)
Why It's in HOP Box
Dr. Amy Killen included fisetin in HOP Box because it represents the cutting edge of senolytic science. Clearing senescent cells is one of the most promising strategies for slowing aging at its source. While we wait for the full results of the Mayo Clinic trials, the preclinical data is exceptionally strong, and fisetin's anti-inflammatory and neuroprotective benefits are already well-supported.
In the Damage Control blend, fisetin works synergistically with quercetin (another proven senolytic) to target zombie cells from multiple molecular pathways.
The HOP Box Difference
- Combined with quercetin for dual senolytic action
- Part of the Damage Control blend with 4 other cell-protective ingredients
- Doctor-formulated by Amy Killen, MD, a longevity medicine specialist
- Convenient daily packs for consistent senolytic support
Ready to help your body clear zombie cells and slow the aging process?
This page is for educational purposes only and is not medical advice. Always consult your healthcare provider before starting any supplement regimen.
Sources cited are peer-reviewed human clinical studies. HOP Box is formulated by Amy Killen, MD.
