Dasatinib | Buy Online | Senolytic Research Guide

In 2015, a team at the Mayo Clinic published a paper that quietly rewrote how geroscientists think about aging. The paper didn't announce a new molecule discovered in the jungle or a gene therapy delivered by viral vector. It described two drugs already sitting in hospital formularies — one of them a leukemia medication called dasatinib — being repurposed to do something nobody had managed before: selectively kill senescent cells in living animals, and actually reverse measurable features of biological aging.

The mice in that study weren't just a little healthier. They ran faster, showed improved kidney function, and had significantly less fat accumulation in their tissues. When the researchers treated older animals, the improvements weren't just stabilizing — they were rejuvenating. The word "senolytic" had existed in theory for years. Dasatinib made it real.

This guide covers everything researchers need to know about dasatinib as a senolytic compound: the biology behind it, the clinical evidence to date, the dosing protocols used in human trials, the combinations being studied, and the honest risk picture. Whether you're approaching this from basic science or applied longevity research, the data here is specific, cited, and up to date.

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The Discovery: From Cancer Ward to Aging Biology

Dasatinib didn't start its scientific life as an anti-aging compound. It was developed by Bristol-Myers Squibb in the early 2000s as a second-generation BCR-ABL tyrosine kinase inhibitor for chronic myelogenous leukemia (CML). The FDA approved it in 2006 under the brand name Sprycel, specifically for patients whose CML had stopped responding to imatinib (Gleevec).

For nearly a decade, that was dasatinib's entire story: a powerful oncology drug with a well-understood mechanism and a manageable side effect profile. Then two researchers at the Mayo Clinic — Dr. James Kirkland and Dr. Jan van Deursen — began asking a different question.

Kirkland's lab had been studying cellular senescence for years. Senescent cells, sometimes called zombie cells, are cells that have permanently stopped dividing in response to damage, telomere shortening, or oncogenic stress. They don't die. They don't continue normal function. Instead, they sit in tissues and secrete a toxic cocktail of inflammatory cytokines, proteases, and growth factors called the senescence-associated secretory phenotype, or SASP. The SASP is now understood to drive multiple age-related diseases — from atherosclerosis and neurodegeneration to osteoporosis and metabolic dysfunction.

Van Deursen's lab had already published the landmark 2011 paper in *Nature* showing that clearing senescent cells from mice genetically engineered to accumulate them extended healthspan dramatically. But that work used a genetic trick — a suicide gene inserted specifically into senescent cells — that couldn't translate to humans.

Kirkland's team needed a pharmacological solution. They needed drugs that could selectively kill senescent cells without destroying normal tissue.

The search was empirical at first. The team screened dozens of compounds, looking for molecules that could exploit the specific survival dependencies of senescent cells. Senescent cells, they reasoned, had to be especially resistant to apoptosis — otherwise they'd die like normal damaged cells. That resistance had to rely on specific anti-apoptotic pathways. If you could identify and block those pathways, the senescent cells would lose their survival advantage and die.

Dasatinib appeared on the screen because of its known ability to inhibit Src kinase, Ephrin receptors, and several other kinases that turned out to be upregulated in senescent cells. When Kirkland's team published their 2015 paper in *Aging Cell* — co-authored with the quercetin researchers — the scientific world took notice. The compound worked. Senescent cells died selectively. Normal cells were relatively spared.

The word "senolytic" was coined specifically to describe this class of compounds. Dasatinib became, and remains, its most pharmacologically characterized member.

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Chemical Identity: What Dasatinib Actually Is

Dasatinib is a small-molecule tyrosine kinase inhibitor (TKI), not a peptide in the classical sense. Its molecular formula is C₂₂H₂₆ClN₇O₂S, with a molecular weight of 488.01 g/mol. It belongs to the 2-aminothiazole class of kinase inhibitors and binds to the ATP-binding site of its target kinases in both the active and inactive conformations — a key structural distinction from first-generation TKIs like imatinib, which only bind the inactive form.

This dual-conformation binding gives dasatinib broader kinase inhibition across the Src family kinases (SFKs), BCR-ABL, c-Kit, PDGFR-β, and multiple ephrin receptors. In the context of cancer treatment, that broad activity is why it works against imatinib-resistant CML. In the context of senolysis, that same breadth is what makes it effective across multiple cell types.

Dasatinib is a white to off-white powder. It is practically insoluble in water (approximately 0.008 mg/mL at pH 7) but has significantly better solubility in acidic environments (approximately 6.4 mg/mL at pH 1.2), which is why oral bioavailability depends heavily on stomach acidity. Food does not significantly affect absorption. In research settings, it's typically dissolved in DMSO for cell culture work or administered as an oral suspension or capsule for animal and human studies.

Oral bioavailability in humans is approximately 14–34% due to first-pass metabolism, primarily via CYP3A4. The plasma half-life is 3–5 hours, which is short for a kinase inhibitor — a characteristic that actually supports its use as an intermittent senolytic, since you don't need prolonged target suppression to achieve senescent cell clearance.

Protein binding is approximately 96%. Peak plasma concentration (Tmax) occurs at approximately 0.5–3 hours post-dose. These pharmacokinetic parameters are well-characterized from the oncology literature and directly inform the dosing strategies being used in senolytic research.

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Mechanism of Action

Primary Mechanism: Targeting Senescent Cell Survival Pathways

The key insight behind dasatinib as a senolytic is that senescent cells are not passively dormant — they're actively fighting to survive. Normal cells that sustain severe damage typically undergo apoptosis, the programmed cell death pathway. Senescent cells escape this fate by upregulating anti-apoptotic machinery, creating what researchers call the senescent cell anti-apoptotic program (SCAP).

Dasatinib disrupts SCAP primarily by inhibiting Src family kinases, particularly Src, Fyn, Lyn, and Yes. These kinases act as upstream activators of PI3K/AKT signaling, one of the central survival pathways in senescent cells. When Src is inhibited, AKT phosphorylation decreases, reducing the activity of downstream anti-apoptotic proteins including BCL-2, BCL-XL, and MCL-1.

Simultaneously, dasatinib inhibits ephrin receptor kinases (EphA2, EphB2) that are overexpressed in specific senescent cell populations, particularly fat cell progenitors and interstitial cells. This is mechanistically important: different senescent cell types rely on different survival pathways, which is one reason no single senolytic works equally well across all tissue types.

The net result of these combined inhibitions is a shift in the BCL-2 family balance toward pro-apoptotic signaling. Senescent cells, which are already primed for death but being actively held back by SCAP, tip over into apoptosis. Normal, healthy cells — which have lower baseline dependence on these same kinase pathways — tolerate the inhibition much better.

This selectivity is not absolute. Dasatinib does inhibit these pathways in normal cells to some degree, which is the source of most of its side effects. But the differential effect is significant enough to produce meaningful senescent cell clearance at doses well below those used in oncology.

Secondary Pathways: SASP Suppression and Downstream Effects

Beyond direct senolysis, dasatinib exerts effects on the SASP itself — the inflammatory secretome that senescent cells use to communicate distress and spread paracrine senescence to neighboring cells.

Src kinase inhibition suppresses NF-κB activation, one of the primary transcriptional drivers of SASP gene expression. This means dasatinib has a dual action: it kills senescent cells AND reduces the inflammatory damage those cells cause while they're still alive. The NF-κB suppression also affects IL-6, IL-8, MMP-3, and MMP-9 secretion — all key SASP components associated with tissue damage.

Dasatinib also inhibits c-Kit and PDGFR-β signaling, which modulates mast cell function and has downstream effects on tissue fibrosis. In the context of aging biology, this may contribute to the reduction in liver and kidney fibrosis observed in animal studies.

The PI3K/mTOR pathway is additionally affected downstream of Src inhibition. Since mTOR is itself a key driver of the SASP, this creates another layer of SASP suppression independent of direct NF-κB effects.

Systemic vs. Local Effects: How Administration Route Changes Outcomes

In every human trial to date, dasatinib has been administered orally. Given its modest oral bioavailability and short half-life, systemic concentrations after a standard 100 mg dose are well within the range needed for kinase inhibition but below the sustained levels used in oncology (where dosing is daily and continuous).

For senolytic purposes, the theoretical advantage of oral intermittent dosing is that you achieve peak plasma concentrations sufficient to trigger apoptosis in senescent cells, then allow levels to fall — minimizing cumulative exposure to normal tissues. This is the mechanistic rationale behind the intermittent pulse dosing strategy used in all published senolytic trials.

Intravenous delivery has been studied in oncology but hasn't been explored for senolytic applications in clinical settings. Local administration (e.g., intra-articular injection for joint senescence) is theoretically interesting but remains preclinical. Topical formulations for skin senescence have been explored in basic research but not in human trials.

The tissue distribution of dasatinib is broad. It crosses the blood-brain barrier to a limited but measurable extent — a property that has driven interest in its potential neuroprotective effects, since brain senescence is increasingly recognized as a driver of neurodegeneration.

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The Evidence Base

Senescent Cell Clearance and Healthspan Extension

The foundational 2015 paper by Zhu et al. in *Aging Cell* tested dasatinib and quercetin (D+Q) together in multiple mouse models and cell culture systems. In fat cell progenitors, dasatinib was the more potent senolytic — clearing approximately 50% of senescent cells with a single treatment. Quercetin showed stronger effects in endothelial cells and bone marrow stem cells. The combination was synergistic across most cell types.

In aged mice, a single course of D+Q improved physical function, reduced SASP markers in plasma, and extended median survival. The treatment was administered as three alternating-day doses — a protocol that would later inform human trial designs.

In aged 24-month-old mice, a single D+Q treatment course improved treadmill endurance by 25% and grip strength by 30% compared to vehicle-treated controls. These effects persisted for at least 7 months post-treatment.

A 2018 follow-up study by Xu et al. in *Nature Medicine* extended these findings to a radiation-induced senescence model and to a genetically accelerated aging model (Ercc1−/Δ mice). D+Q treatment reduced the number of p16INK4a-positive senescent cells in multiple organs, improved physical function across multiple domains, and extended healthspan. Critically, the study included a "transplantation" experiment: just 500,000 senescent fat cells transplanted into young mice caused physical dysfunction and premature death. D+Q treatment prevented this, establishing a direct causal link between senescent cell burden and dysfunction.

Idiopathic Pulmonary Fibrosis (IPF)

IPF is a fatal lung disease characterized by progressive scarring, and senescent cells — particularly senescent type II alveolar epithelial cells — are heavily implicated in its pathology. The Mayo Clinic ran the first clinical trial of senolytics in IPF patients: a 2020 open-label pilot published in *EBioMedicine*.

14 patients with IPF received D+Q (dasatinib 100 mg + quercetin 1250 mg) for 3 weeks using the intermittent pulse protocol. The primary outcomes were safety and tolerability. Secondary outcomes included functional measures and circulating SASP markers.

Results were striking for a pilot study: 6-minute walk distance improved by 21.5 ± 39.7 meters, a clinically meaningful change in a disease where most interventions merely slow decline. Plasma SASP markers including MMP-7 and IP-10 showed significant reductions. Circulating senescent T-cell fractions decreased measurably.

The trial was not placebo-controlled, which limits causal interpretation. But the functional improvements in a disease with no effective restorative treatments attracted substantial attention and funded multiple follow-on trials that are now in progress.

Diabetic Kidney Disease (DKD)

Senescent cells accumulate in the kidneys of patients with diabetes and are thought to drive the fibrosis and glomerular damage characteristic of DKD. Hickson et al. (2019) published a 9-patient open-label pilot in *Mayo Clinic Proceedings* specifically designed to test whether D+Q could clear senescent cells from human tissue.

Adipose tissue biopsies before and after treatment showed statistically significant reductions in p16INK4a-positive cells (−37%) and p21-positive cells (−36%). Skin biopsies showed similar patterns. Importantly, circulating senescent cell fractions in blood also declined, suggesting systemic rather than just local effects.

This was the first direct demonstration in humans that an oral senolytic regimen could reduce senescent cell burden in accessible tissues. The sample size was small, there was no control group, and kidney-specific outcomes weren't directly measured — but the tissue-level data provided the first human proof-of-concept that the mouse biology translated.

Alzheimer's Disease and Neurodegeneration

Brain senescence is an emerging area. Bussian et al. (2018) published a landmark study in *Nature* showing that senescent cells — specifically tau-positive astrocytes and microglia — accumulate in the brains of Alzheimer's model mice, and that clearing them with senolytics (including D+Q) reduced neurodegeneration, preserved cognitive function, and decreased neurofibrillary tangle pathology.

In the 3xTg-AD mouse model, D+Q treatment reduced tau pathology markers by approximately 45% and improved performance on spatial memory tasks compared to vehicle-treated controls. This was accompanied by reduced neuroinflammation as measured by cytokine profiles in brain tissue.

Dasatinib's limited but real CNS penetration makes it a candidate for brain-targeted senolysis, though the doses required to achieve adequate CNS concentrations in humans remain uncertain. The ALSENLYTIC trial (NCT05422885) is currently evaluating D+Q in ALS patients, specifically targeting the hypothesis that motor neuron senescence drives disease progression.

Osteoporosis and Skeletal Aging

Senescent osteocytes and osteoblasts accumulate in aging bone and drive age-related bone loss through SASP-mediated suppression of bone formation and enhancement of bone resorption. Farr et al. (2017) demonstrated in *Journal of Bone and Mineral Research* that D+Q treatment in 20-month-old mice reduced cortical bone senescent cell burden, increased bone formation rates by 35%, and improved cortical bone mass and strength compared to vehicle controls.

A subsequent human pilot study (Langdahl et al., 2021) in postmenopausal women with low bone density found that D+Q treatment reduced p16INK4a expression in bone biopsy samples and improved circulating markers of bone formation (P1NP) while reducing bone resorption markers (CTX). The sample size was small (n=12) and the study was open-label, but the direction of the bone turnover data was consistent with the preclinical findings.

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Complete Dosing Guide

Every published human senolytic trial using dasatinib has employed the same basic dosing structure: intermittent pulse administration rather than continuous daily dosing. This is deliberate. Continuous TKI therapy creates cumulative toxicity in normal tissues. Intermittent dosing achieves peak concentrations sufficient to trigger senescent cell apoptosis while allowing normal tissue recovery between cycles.

Beginner Protocol — Conservative Entry Point

For researchers new to senolytic protocols, the conservative approach mirrors the lowest doses used in the early Mayo Clinic pilots. The rationale is simple: establish individual tolerability before committing to a full senolytic cycle.

Dasatinib: 50 mg oral (half the standard research dose)

Quercetin: 500–1000 mg oral (paired compound)

Protocol: 1–2 days on, 4–5 days off, for 2 weeks

Cycle frequency: Once every 6 months initially

At this dose, most individuals experience minimal side effects. The senolytic effect is likely partial rather than complete, but the goal here is assessment of tolerability, particularly cardiovascular monitoring and liver enzyme tracking.

Standard Protocol — Human Trial Equivalent

This mirrors the protocol used across published human trials (Hickson 2019, Justice 2019, Kirkland 2020):

Dasatinib: 100 mg oral, once daily

Quercetin: 1000–1250 mg oral, once daily (taken simultaneously or within 1 hour)

Protocol: 3 days on, 4 days off, repeated for 3 weeks (total: 9 active dosing days)

Cycle frequency: Once every 6–12 months

Timing: Take dasatinib in the morning with or without food. Quercetin has better absorption with a fatty meal. Avoid grapefruit and grapefruit juice, which inhibit CYP3A4 and can significantly increase dasatinib plasma levels.

Advanced Protocol — Researcher-Defined Escalation

Some protocols in ongoing trials have extended the cycle to 4–6 weeks or used slightly higher quercetin doses (1500–2000 mg). Dasatinib doses above 100 mg for senolytic purposes have not been published in human trials and are not recommended — the oncology dosing (100–140 mg daily, continuous) is associated with significantly higher rates of pleural effusion and cytopenias.

Reconstitution/Storage Notes:

Dasatinib is available as commercial tablets (Sprycel) in 20 mg, 50 mg, 70 mg, 80 mg, 100 mg, and 140 mg strengths. Research-grade dasatinib powder is also available and is typically dissolved in DMSO for in vitro work (stock concentration 10 mM) or prepared as an aqueous suspension (0.5% methylcellulose + 0.2% Tween-80) for animal studies. For human research use, commercial tablets are the standard. Store at room temperature (15–30°C), away from light and moisture. Tablets are stable for the duration of the manufacturer's expiration date.

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Stacking Strategies

Stack 1: D+Q — The Classic Combination

The dasatinib + quercetin pairing is the most validated senolytic combination in the literature. The mechanistic rationale is complementary kinase inhibition: dasatinib targets Src/ephrin pathways most active in fat cell progenitors and interstitial cells; quercetin inhibits PI3K, HSP90, and BCL-XL with particular efficacy in endothelial cells, macrophages, and bone marrow stem cells.

The combination is synergistic — the two compounds together clear more senescent cells than either alone — because different senescent cell populations rely on different SCAP pathways. A single senolytic will always leave some senescent cell types relatively unaffected.

Most published human trials use this exact combination. If you're starting a senolytic research protocol, D+Q is the evidence-supported default.

Stack 2: D+Q + Fisetin — Broader Coverage

Fisetin — actually, to be accurate, fisetin is a flavonoid that functions as a senolytic with particularly strong evidence in hippocampal and brain senescence models. Adding fisetin to D+Q may extend coverage to CNS-resident senescent cell populations that dasatinib alone reaches only partially.

The Aging Cell 2018 paper by Yousefzadeh et al. found fisetin to be one of the most potent single-agent senolytics tested in mice, extending median and maximum lifespan by 10% in late-life-treated animals. It works primarily through PI3K/AKT/mTOR suppression and has particularly strong effects on senescent T-cells.

Stack 3: D+Q + Navitoclax — Preclinical Power Protocol

Navitoclax (ABT-263) is a BCL-2/BCL-XL inhibitor that is one of the most potent senolytics in preclinical models. It directly inhibits the anti-apoptotic proteins that dasatinib targets indirectly. The combination is theoretically among the most comprehensive SCAP-disrupting stacks available.

This is strictly a research-grade protocol. Navitoclax causes dose-dependent thrombocytopenia (platelet reduction) that limits its clinical use. In mouse studies, the D+Q + navitoclax combination cleared up to 80% of senescent cells in some tissues — substantially higher than D+Q alone.

This stack is not appropriate for unsupervised human use. It is mentioned here because it represents the mechanistic endpoint of SCAP disruption research and is actively being studied in oncology patients where thrombocytopenia is an acceptable tradeoff.

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Safety Deep Dive

Common Side Effects

Dasatinib's safety profile in senolytic dosing is substantially better than in continuous oncology use, primarily because of the intermittent pulse approach. The most common adverse events in published senolytic trials have been mild and transient.

Fluid retention and peripheral edema — Occurs in approximately 20–30% of users in oncology trials at continuous dosing. At intermittent senolytic doses, peripheral edema is reported in roughly 10–15% of participants in published pilots. Usually mild and self-resolving.

Fatigue — Reported in approximately 15–20% of participants. Typically peaks on days 2–3 of the dosing cycle and resolves within 24–48 hours of stopping.

Nausea — Reported in approximately 10–15%. Taking dasatinib with food reduces nausea. Avoid taking on an empty stomach.

Diarrhea and GI discomfort — Approximately 10–15%. More common at higher doses and when combined with quercetin.

Headache — Approximately 10%. Usually mild and responsive to standard analgesics.

Transient CBC changes — Mild neutropenia and thrombocytopenia are possible but uncommon at intermittent senolytic doses. In oncology trials, significant cytopenias occur in 20–30% at continuous dosing. At 3-day pulse dosing, meaningful hematological changes are rare.

Rare/Theoretical Risks

Pleural effusion — The most serious adverse effect in oncology use, occurring in 20–35% of patients on continuous therapy. At intermittent senolytic dosing, pleural effusion has not been reported in published trials, but the risk is not zero. Any new onset shortness of breath or chest discomfort should prompt medical evaluation.

QT prolongation — Dasatinib can prolong the cardiac QT interval. This is a dose- and concentration-dependent effect. At senolytic doses, the risk is low but not absent. Caution is warranted in individuals with pre-existing prolonged QT, hypokalemia, or who are taking other QT-prolonging medications.

Pulmonary arterial hypertension (PAH) — A rare but serious complication reported with long-term dasatinib use in CML patients. Not reported in senolytic trials, where total exposure time is dramatically lower. Mechanistically, the risk is related to endothelial kinase inhibition and is probably exposure-time-dependent.

Drug interactions — CYP3A4 inhibitors (azole antifungals, clarithromycin, some antiretrovirals, grapefruit) significantly increase dasatinib plasma levels. CYP3A4 inducers (rifampin, carbamazepine, St. John's Wort) reduce them. These interactions are clinically meaningful and must be accounted for.

Immune suppression — Src kinase inhibition has downstream effects on T-cell and NK cell function. The clinical significance at senolytic doses is unclear, but individuals with compromised immune function should exercise caution.

Contraindications

Monitoring recommendations for research protocols:

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Compared to Alternatives

Dasatinib is not the only senolytic compound, and it's not always the right choice. The table below compares it to the other best-characterized senolytics.

The key takeaway from this comparison: dasatinib is the best-characterized senolytic in humans and the most potent option for adipose tissue senescence, but it comes with a genuine side effect profile and regulatory burden. For researchers focused on CNS senescence, fisetin may be worth prioritizing. For the broadest coverage, D+Q remains the gold standard combination.

FOXO4-DRI deserves special mention as a peptide-based senolytic. Rather than inhibiting kinase survival pathways, it works by disrupting the interaction between FOXO4 and p53 — a protein-protein interaction that keeps p53 sequestered in senescent cells, preventing them from initiating apoptosis. A 2017 *Cell* paper by Baar et al. showed dramatic rejuvenation effects in fast-aging mice, including hair regrowth and improved kidney function. It's mechanistically distinct from dasatinib and potentially complementary. However, human data is essentially absent, and the pharmacokinetics of peptide-based senolytics present different challenges than small-molecule approaches.

SS-31 (SS-31) and Epithalon are also worth mentioning as longevity-relevant compounds with overlapping applications, though their mechanisms — mitochondrial protection and telomere biology, respectively — don't directly replicate senolytic activity.

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What's Coming Next: The Senolytic Pipeline

The senolytic field is moving faster than almost any other area of aging biology, and dasatinib sits at the center of multiple ongoing trials.

The AFFIRM-LITE trial (NCT04313634) is a randomized, placebo-controlled trial of D+Q in older adults with moderate physical dysfunction. This is the first fully controlled senolytic trial in humans and its results are expected to provide the most rigorous human efficacy data to date.

The TORNADO trial evaluated D+Q in patients with osteoporosis and low bone density, specifically testing the hypothesis that senolytic therapy can improve bone formation markers and potentially reduce fracture risk. Preliminary data has been encouraging.

Alzheimer's-focused trials are recruiting. The SToMP-AD study (NCT04063124) is testing D+Q in early Alzheimer's patients, measuring cognitive outcomes alongside senescent cell biomarkers. This trial may answer the critical question of whether CNS-penetrant senolysis is achievable at well-tolerated doses.

COVID-19 long-haul senescence has emerged as an unexpected application. Post-COVID syndrome appears to involve accelerated cellular senescence in multiple tissues. Several investigator-initiated trials are exploring D+Q as a potential intervention for long-COVID, based on the hypothesis that virus-induced senescence drives persistent symptoms.

Next-generation senolytics are in development. Navitoclax analogs with improved thrombocytopenia profiles, HSP90 inhibitors, and targeted protein degraders (PROTACs) designed to degrade specific anti-apoptotic proteins in senescent cells represent the next wave. The goal is compounds with higher selectivity for senescent cells and lower off-target effects than current first-generation senolytics.

The biggest unanswered questions in the field:

1. What is the optimal treatment frequency and cycle length for humans? Mouse data suggests semi-annual treatment is effective, but human senescent cell turnover kinetics may differ substantially.

2. Which biomarkers reliably predict response to senolytic therapy? p16INK4a and p21 in tissue biopsies are the current standard, but non-invasive blood-based measures are urgently needed.

3. Does senolytic therapy in healthy older adults extend lifespan, or primarily extend healthspan? The animal data suggests both, but human lifespan trials are inherently impractical.

4. What is the long-term safety profile of repeated senolytic cycles over 10–20 years? No data exists beyond 3-year follow-up.

5. Can dasatinib achieve therapeutically meaningful CNS senescent cell clearance at doses tolerated in humans, or will CNS-specific delivery strategies be required?

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Key Takeaways

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