Can you really grow new brain cells quickly? What the science says

What did @robertwblove actually say?

Robert Love, who describes himself as a neuroscientist focused on Alzheimer's prevention, claims you can "grow new brain cells quickly" using three strategies: learning new things, taking supplements (lion's mane, hesperidin, and fish oil), and exercise. He calls exercise "the absolute most powerful" driver of neurogenesis. He cites Dr. Elizabeth Gould's research at Princeton as proof that adult neurogenesis happens in humans, and says lion's mane works by boosting BDNF, a growth factor tied to new brain cell formation. He also recommends 20 to 40 minutes of zone two aerobic training daily.

The framing is confident and specific. He names researchers, spells out supplement names, and connects neurogenesis directly to Alzheimer's prevention and memory improvement. That combination of specificity and broad health claims warrants a close look at what the research actually supports.

Does the science back this up?

Partially, and with some important caveats the video glosses over. The exercise claim is the strongest. The supplement claims are weaker than they sound.

Exercise and BDNF: this is well-established. Multiple human trials, including work by Erickson et al. (2011, PNAS) showing hippocampal volume increases with aerobic exercise in older adults, support the connection between aerobic exercise and neuroplasticity. Zone two training specifically has research support from Iaia and Bangsbo (2010, Scandinavian Journal of Medicine and Science in Sports) for mitochondrial efficiency, though the direct neurogenesis link at that specific intensity in humans is less pinned down than Love implies.

Lion's mane and BDNF: the in vitro and rodent data are interesting. Mori et al. (2009, Phytotherapy Research) showed cognitive improvements in older adults with mild cognitive impairment, but the sample was small (30 people) and the BDNF mechanism in humans is not confirmed. The leap from "lion's mane raises NGF in mice" to "grows new brain cells" is not a straight line.

Hesperidin: the evidence here is the thinnest. Most studies are preclinical. Referring to it as "great for growing new brain cells" in humans is an overclaim.

What did they get wrong (or right)?

The Elizabeth Gould citation is legitimate. Gould's lab at Princeton did produce important work on adult neurogenesis in mammals, including primates. But Love skips the controversy: a significant 2018 study by Sorrells et al. (Nature) found no evidence of new neurons in the adult human hippocampus, directly challenging the consensus he presents as settled. Boldrini et al. (2018, Cell Stem Cell) pushed back on Sorrells, but the field is genuinely contested. Telling 7.4 million viewers this is resolved science is not accurate.

The claim that "there are research articles talking about humans growing new brain cells into their 90s" is technically true but misleading without context, given the active scientific dispute about whether human adult hippocampal neurogenesis occurs at all at meaningful levels.

He gets credit for placing exercise above supplements in terms of importance. That ranking reflects the evidence hierarchy. And connecting DHA from fish oil to brain structure is defensible, supported by Yurko-Mauro et al. (2010, Alzheimer's and Dementia). The Alzheimer's prevention framing, however, outpaces what any of these interventions have demonstrated in clinical trials.

What should you actually know?

Adult neurogenesis in humans is real but contested, not settled. The honest position is that aerobic exercise is the single lifestyle intervention with the most consistent human evidence for hippocampal health. It should be your priority, not the supplements.

Lion's mane is interesting and probably safe at typical doses, but calling it "terrific" for growing new brain cells in humans is ahead of the data. The strongest human trial is a 2023 study by Saitsu et al. (Scientific Reports) suggesting modest cognitive benefits, not confirmed neurogenesis. Hesperidin has even less human evidence. Fish oil and DHA are better supported for general brain health than for neurogenesis specifically.

• None of these supplements have been proven to prevent Alzheimer's disease in humans.
• Zone two exercise recommendations are reasonable but the specific neurogenesis mechanism at that intensity in humans is not confirmed by direct evidence.
• If you are managing cognitive decline concerns, talk to a physician before treating supplement recommendations from social media as a protocol.

Love is directionally right about exercise. He is ahead of the evidence on supplements, and he presents a contested scientific debate as closed. That matters when the hashtags include alzheimers and dementia.