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Yes—but only in a limited, qualified sense. Current human evidence supports neural stem-cell, neuroblast and immature-neuron populations in the adult hippocampus, particularly the dentate gyrus. It does not yet establish how many fully mature neurons adults produce, how consistently those cells integrate into working circuits, or what they contribute to human cognition.
The distinction matters: finding a molecular signature in post-mortem tissue is not the same as watching a cell divide, mature and connect to a living human brain network. Adult neurogenesis is supported, its scale and significance remain unsettled, and no supplement, app, device or exercise program has been proven to increase new-neuron production in humans.
What “growing new brain cells” means
Neurogenesis is the creation of new neurons from precursor cells. In adults, the evidence concerns a specific region rather than the brain as a whole: the hippocampus, especially the dentate gyrus, an area involved in memory formation and spatial processing. It is not evidence that adults routinely replace neurons throughout the cortex, cerebellum or other brain regions.
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- Neural stem cells: self-renewing precursor cells that can generate several neural cell types.
- Neuroblasts: developing neuronal precursors.
- Immature granule neurons: young neurons in the dentate gyrus that have not necessarily reached a mature, circuit-integrated state.
- Mature, integrated neurons: cells that survive, develop the expected properties, connect with other neurons and contribute to information processing.
A study can detect one stage without demonstrating the next. Therefore, “adult neurogenic cells are present” is a stronger conclusion than “adults continually add functional neurons,” and both are more precise than saying “the adult brain grows new cells.”
What the 2026 human study adds
A 2026 Nature study titled Human hippocampal neurogenesis in adulthood, ageing and Alzheimer’s disease analyzed 355,997 nuclei from human hippocampal samples. Using single-nucleus RNA sequencing together with chromatin-accessibility profiling, the researchers identified molecular profiles consistent with neural stem cells, neuroblasts and immature granule neurons.
The study examined a broad set of post-mortem cohorts:
- young adults with intact cognition;
- older cognitively intact adults;
- SuperAgers with unusually strong episodic-memory performance;
- people with preclinical, intermediate Alzheimer’s pathology; and
- people with Alzheimer’s disease.
For a regulatory analysis focused on young adults, the team profiled 85,977 nuclei from eight cognitively intact people aged 20 to 40. These are nuclei extracted from preserved tissue, not cells observed in a living brain. The approach provides unusually detailed information about gene activity and chromatin state, but it cannot directly follow a cell from division through maturation and circuit integration.
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What changed with ageing and Alzheimer’s pathology
The researchers reported early changes in chromatin accessibility in neurogenic-cell profiles from people with preclinical Alzheimer’s pathology. Alterations were more evident in Alzheimer’s disease. They also found a distinct molecular pattern in SuperAgers that the authors described as potentially consistent with a resilience signature.
Those findings are associations. They do not show that newly generated neurons produce exceptional memory, that losing them causes Alzheimer’s symptoms, or that restoring them would prevent disease. The study’s authors explicitly state that the origin and functional relevance of these cells remain poorly understood.
The authors summarized the field’s central uncertainty this way: “The existence of human hippocampal neurogenesis has long been disputed and its relevance in cognition remains unknown.”
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Why scientists still disagree
Human neurogenesis studies often use tissue collected after death. Results can change with the interval between death and preservation, the chemical fixation process, the marker selected, the condition of the sample and the computational rules used to classify cells. A negative result may mean that a marker was lost or that a cell was difficult to classify; it is not automatically proof that no new neurons exist.
Marker specificity is another problem. Molecular signatures associated with immature neurons can overlap with signatures of inhibitory neurons or stressed cells. Species differences also matter: a marker that reliably identifies a stage in a mouse brain may be less specific in human tissue.
The opposing 2018 findings
Two influential studies published in 2018 reached sharply different conclusions. Sorrells and colleagues reported that hippocampal neurogenesis declines steeply during childhood to levels they could not detect in adults. Boldrini and colleagues reported that immature neurons persist throughout adult life.
A 2018 review by Gerd Kempermann and colleagues explained how post-mortem delay, fixation, marker choices and study design could produce such divergent observations. The disagreement is therefore not simply a matter of one side counting correctly and the other incorrectly. Each method samples a different biological stage under different technical conditions.
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The 2026 multiomic study strengthens the case that adult human hippocampal neurogenic populations exist, but it does not erase the unresolved questions about their production rate, lineage, survival, maturation or contribution to behavior.
How researchers look for adult-born neurons
Different methods answer different questions. Treating their results as interchangeable creates much stronger claims than the evidence allows.
| Method | What it measures | What it can support | What it cannot establish alone |
|---|---|---|---|
| Birth-dating with BrdU or related labels | Whether cells were dividing during a defined labeling window | Evidence of cell proliferation and, with follow-up, possible survival | That a labeled cell became a mature, functional neuron in a human circuit |
| Radiocarbon birth-dating | Population-level timing inferred from carbon-14 incorporation | Estimates of neuronal turnover over a person’s lifetime | A precise daily count for every adult or direct observation of individual-cell integration |
| Histological markers | Proteins associated with progenitors or immature neurons in tissue sections | Presence of cells expressing selected developmental markers | That the marker is perfectly specific or that the cells completed maturation |
| Single-nucleus RNA sequencing | Gene-expression profiles from individual nuclei | Molecularly defined cell populations and developmental states | A live lineage trace showing division, maturation and synaptic integration |
| Chromatin-accessibility profiling | Regulatory DNA regions that are open or closed in each profile | Evidence of state changes and regulatory programs associated with neurogenic cells | Direct proof that a regulatory state produced a functioning neuron |
The most persuasive interpretation combines methods: a molecular profile can identify a plausible immature-neuron population, while birth-dating or anatomical evidence may address when cells were generated. None of these approaches, by itself, demonstrates the complete sequence in a living adult human.
What happened to the “700 new neurons a day” claim?
A frequently repeated figure is roughly 700 new neurons per day in the adult dentate gyrus. A 2026 review of neurogenesis methods attributes that estimate to Spalding and colleagues’ 2013 radiocarbon birth-dating work.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteIt is a model-based, population-level estimate, not a universally accepted modern count. Radiocarbon calculations depend on assumptions about carbon-14 exposure, cell populations and turnover, and they have limited spatial resolution. The number should therefore be presented with its source and method, not as a fixed biological allowance that every adult receives each day.
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It is also easy to confuse that estimate with the 2026 study’s sample sizes. The figures 355,997 nuclei and 85,977 nuclei describe how much tissue-derived molecular data the researchers analyzed; they are not counts of newly born neurons.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Do new hippocampal neurons affect memory?
Animal studies connect adult-born hippocampal neurons with learning and memory processes, including pattern separation—the ability to distinguish similar experiences or locations. Experiments in rodents can selectively manipulate neurogenesis and then test behavior, giving researchers a level of causal control that is not available in people.
Human studies cannot currently perform the same targeted manipulations. The presence of immature-neuron signatures in a human hippocampus therefore does not prove that those cells improve memory, protect against dementia or perform exactly the same role observed in rodents. Human functional relevance remains an open question.
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The SuperAger and Alzheimer’s findings are similarly limited. A molecular pattern associated with exceptional memory may reflect resilience, a consequence of other biology or an unrelated difference. An alteration associated with Alzheimer’s pathology may be involved in disease, result from disease or reflect tissue-level changes that do not determine symptoms.
Can exercise, supplements or brain-training apps increase neurogenesis?
Not on the evidence currently available for humans. Exercise, enriched environments, learning and several compounds can influence neurogenesis-related pathways in animal models. Translating those findings into a proven increase in fully integrated human neurons requires direct human evidence that does not yet exist.
A 2026 review describes proposed human intervention effects as unproven. That means a product marketed as a “neurogenesis booster” is making a claim beyond what current human research establishes. Exercise may still be valuable for cardiovascular health, mood and general brain health, but those benefits should not be presented as proof that it grows a measurable number of new human neurons.
How to interpret a new neurogenesis headline
- Identify the species. A mouse result is not direct evidence about adult humans.
- Locate the brain region. Adult human evidence is concentrated in the hippocampus and dentate gyrus, not the entire brain.
- Ask which stage was measured. Cell division, a progenitor marker, an immature-neuron signature and mature integration are different findings.
- Check the tissue source. Post-mortem molecular data are informative but are not live observations.
- Separate association from causation. A profile linked with memory or Alzheimer’s pathology does not prove that it causes either outcome.
- Look for a human intervention test. Animal pathway changes or a commercial claim do not establish that a supplement, app or device increases human neurogenesis.
What is established—and what is not
| Question | Best-supported answer |
|---|---|
| Are neurogenic cell populations found in adult human hippocampus? | Yes. Multiple lines of evidence, including the 2026 multiomic study, support progenitor and immature-neuron populations. |
| Does the whole adult brain routinely replace neurons? | No. The evidence is region-specific and does not support that broad claim. |
| How many new human neurons are made? | No modern, universally agreed rate is established. The approximately 700-per-day figure is an older, model-based estimate from radiocarbon work. |
| Do identified cells mature and integrate into circuits? | That complete process has not been directly demonstrated at the required scale in living humans. |
| Do these cells improve memory or prevent Alzheimer’s disease? | Human functional effects remain unknown; current associations do not prove protection or causation. |
| Can a consumer product be recommended to grow new human neurons? | No intervention is established for that purpose by current human evidence. |
The practical answer
Adults probably can generate at least some new cells in the hippocampus, but science cannot yet tell you a dependable personal rate or promise a cognitive benefit. The strongest current conclusion is deliberately narrow: adult human hippocampal tissue contains molecularly identifiable neurogenic populations, and those populations change with age and Alzheimer’s pathology. Whether they regularly become mature, integrated neurons—and what those neurons do in human cognition—remains unresolved.
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