Senolytics are drugs designed to clear out senescent cells, the worn-out cells that build up as we age. In mice, they have delayed many age-related problems. In people, the trials so far are small and the results are mixed. One of the field’s leading researchers, Dr. James Kirkland, urges people not to take senolytics or similar supplements outside a clinical trial because they haven’t been confirmed as safe (National Institute on Aging).
Here’s what senescent cells are, what human studies have actually shown and how to take part in research if you’re interested.
What senescent cells are
Normally, when a cell is badly damaged, your body clears it out. As we age, that cleanup works less well. Some damaged cells stop dividing but don’t die. Scientists call them senescent cells.
These cells linger and release signals that can cause inflammation and harm nearby healthy cells. Researchers think they may play a part in many age-related conditions. The NIA notes that scientists are studying senolytics for osteoporosis, glaucoma, macular degeneration, diabetic nerve damage and more.
What happened in mice
The mouse results are what made headlines. According to the NIA:
- Middle-aged mice given senolytics had later onset of several age-related problems.
- Older mice given a combination of dasatinib and quercetin (D+Q) were faster and stronger than untreated mice.
- In other studies, older mice given D+Q lived 36% longer on average.
But mice are not people. Kirkland told the NIA, “anything that sounds too good to be true in mouse or cell culture models usually is.”
What human trials have found
Here are five of the best-known human studies. All were small.
1. Lung scarring (idiopathic pulmonary fibrosis), 2019. This was the first human senolytic trial. 14 people took D+Q 3 days a week for 3 weeks. There was no placebo group. Walking distance, walking speed and chair-stand times improved. Lung function and frailty scores did not change. There was one serious side effect, and many mild ones like breathing symptoms, skin bruising and stomach upset (PubMed 30616998).
2. Diabetic kidney disease, 2019. 9 people, average age about 69, took D+Q for 3 days. Eleven days later, they had fewer senescent cells in fat and skin, and lower levels of some inflammation markers. This was the first direct proof that these drugs can clear senescent cells in people. It did not test whether anyone felt better or lived longer (PubMed 31542391).
3. Early Alzheimer’s disease, 2023. 5 people with an average age of 76 took D+Q for 12 weeks. Dasatinib reached the spinal fluid in 4 of 5. Quercetin was not detected there. The drugs were well tolerated, but thinking skills and brain scans showed no significant change (PubMed 37679434).
4. Bone health in older women, 2024. This was a real randomized trial. 60 women aged 62 to 88 took D+Q on and off for 20 weeks, or no treatment. The main goal, a marker of bone breakdown, did not change. A bone-building marker rose at 2 and 4 weeks but was back to normal by week 20 (NIA). In a side analysis, women with the most senescent cells had a 2.7% gain in wrist bone density. That finding needs testing in a new trial (PubMed 38956196).
5. An eye drug for diabetic macular edema, 2025. 65 people got UBX1325, a senolytic injected into the eye, or a sham shot. At 48 weeks, vision was 5.6 letters better on an eye chart, but the result was not statistically significant. No one stopped because of side effects (PubMed 40261111).
What this adds up to
- Senolytics can clear senescent cells in people. That part looks real.
- Proof that they help you feel or function better is weak. The best results came from studies with no placebo group.
- The one solid randomized trial missed its main goal.
- Long-term safety is unknown. Kirkland said, “We haven’t so far seen serious or severe adverse events in clinical trials with some of these agents, but it doesn’t mean they won’t happen.”
Why you shouldn’t try senolytics on your own
You can buy quercetin as a supplement. Some websites also sell “senolytic” blends. Here’s why to hold off:
- Dasatinib is a prescription cancer drug. It is not approved for aging, and taking it without close medical care is risky.
- Supplements aren’t tested like drugs. The dose and purity in a bottle may not match the label.
- Interactions are a real concern. Many older adults take several medicines. Adding unproven pills raises the risk of side effects. Our guide to taking many medicines safely explains why.
- No human study has shown a longer life.
How to join a senolytic trial
If you want to help move this research forward, a trial is the safe way to do it.
- Search ClinicalTrials.gov. Type “senolytic” or “dasatinib quercetin” at ClinicalTrials.gov. Each listing shows who can join, where it is and whether it’s recruiting.
- Ask your doctor to review a trial with you before you sign up.
- Ask the study team about the risks, how you’ll be watched and what happens if you have side effects.
Most trials are run at large academic medical centers. Mayo Clinic has led much of this work.
What you can do now that is proven
While researchers test senolytics, these steps have good evidence for healthy aging:
- Move every day. Aim for the CDC goal of 150 minutes a week of moderate activity, plus strength and balance work.
- Eat a mostly plant-based, low-processed diet. Our anti-inflammatory diet guide covers what studies show.
- Protect your brain by managing blood pressure, hearing and other risk factors. See our dementia prevention guide.
- Be careful with trendy fasting plans. Our intermittent fasting guide explains what’s known for people over 65.
Common questions
What are senolytics?
They are drugs designed to clear out senescent cells, which are damaged cells that stop dividing but don’t die. The best-studied combination is dasatinib plus quercetin (D+Q).
Do senolytics work in humans?
Small studies show they can lower senescent cells in people. But proof that they improve health is weak, and the only sizable randomized trial, in 60 older women, missed its main goal.
Is it safe to take quercetin or fisetin for aging?
It hasn’t been proven safe or effective for that use. A leading researcher urges people not to take senolytics or similar supplements outside a clinical trial.
Can I get dasatinib for anti-aging?
Dasatinib is a prescription cancer drug. It is not approved for aging. The safe way to try it is in a supervised clinical trial.
How do I find a senolytic clinical trial?
Search “senolytic” on ClinicalTrials.gov and review any listing with your doctor before you contact the study team.
Written by Khasim Basha Shaik. I research and compare health and Medicare topics for readers. I am not a licensed doctor, pharmacist or other medical professional. This article summarizes National Institute on Aging materials and published trial results and is not medical advice. Last reviewed October 19, 2026.
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