Testosterone and brain cell survival: does it boost memory?

Yes, in animal studies testosterone appears to help new brain cells survive in the hippocampus, a region important for memory. A 2020 review found clear evidence that testosterone increases adult neurogenesis in the dentate gyrus through an androgen-dependent pathway, mainly by enhancing survival of new neurons rather than their production. However, whether this translates into improved memory in humans is not yet established.

Key takeaways

• Testosterone boosts survival of newly born neurons in the hippocampus, not their initial proliferation, according to a 2020 review.
• Timing matters: in castrated male rats, two weeks of testosterone given later in the cells' development helped spatial memory, while earlier injections did not, per a PsyPost report.
• Androgens and progestogens favor neuronal renewal by increasing cell survival, while estrogens increase proliferation, notes a 2017 review.
• Human evidence is lacking; most findings come from rodents and other animals, so claims about memory improvement in people remain speculative.

What does the research actually show about testosterone brain cell survival?

Animal studies consistently show that testosterone enhances the survival of new neurons in the hippocampus, but the effect is on survival, not on the birth of new cells.

A 2020 review of testosterone and adult neurogenesis concluded that testosterone increases adult neurogenesis in the dentate gyrus through an androgen-dependent pathway. Most evidence indicates that androgens selectively enhance the survival of newly generated neurons while having little effect on cell proliferation. A 2017 review on sex steroids and neurogenesis similarly states that androgens and progestogens favor neuronal renewal by increasing cell survival, whereas estrogens increase proliferation.

These findings come largely from laboratory rodents, with initial evidence from birds and wild rodent populations. The 2020 review notes that whether androgens act directly on receptors of new neurons remains unclear, and indirect routes involving brain-derived neurotrophic factor (BDNF) and glucocorticoids may be involved.

Does timing of testosterone exposure matter for memory?

Yes, timing appears to matter: in a rat study, testosterone given later in the new cells' development improved spatial memory, while earlier exposure did not.

According to a PsyPost article, in castrated male rats, a month of testosterone injections boosted the survival of newly born neurons in the hippocampus. Two weeks of injections given later in the cells' development helped in the spatial-memory region, while earlier injections did not. This suggests a window during which testosterone can support the survival of new neurons that are already forming, rather than prompting their creation.

The 2020 review supports this idea: androgens mainly affect survival, not proliferation. So the timing of exposure relative to the cells' maturation stage could influence whether memory benefits appear.

Can testosterone improve memory in humans?

There is no solid evidence yet that testosterone improves memory in humans through neurogenesis; the memory benefits observed in animals have not been confirmed in people.

The studies cited here are in animals, mostly rodents. The 2020 review states that the functional significance of adult neurogenesis remains unclear, and it does not establish a link between testosterone, new neuron survival, and memory performance in humans. The 2017 review notes that aging is characterized by cognitive deficiency paralleled by a decrease in neuronal renewal and circulating gonadal hormones, but this is an association, not proof that testosterone supplementation improves memory.

Human research on testosterone and cognition exists, but it is not covered by the sources provided here. Without direct human evidence, any claim that testosterone boosts memory via new brain cell survival is speculative.

What about testosterone and brain cell survival after injury?

Some animal research suggests testosterone may support neuronal survival after injury, but this is separate from normal memory function and remains preliminary.

A 2022 study in rats found that testosterone treatment restored vestibular function by enhancing neuronal survival in a model of repetitive mild traumatic brain injury. This points to a broader neuroprotective role for testosterone in certain contexts, but it does not mean testosterone improves memory in healthy people. The 2020 review also mentions in vitro experiments suggesting broad-ranging neuroprotective effects of testosterone.

How can I support my memory and learning, including Dutch?

Focus on proven habits: sleep, exercise, stress management, and active practice. While testosterone's role in human memory is unproven, these strategies have solid support for learning and memory.

For language learners, calming the nervous system can make speaking practice easier. Here are some Dutch phrases to use in daily practice:

• Ik oefen elke dag een beetje.: I practice a little every day.
• Kun je dat herhalen?: Can you repeat that?
• Ik voel me nerveus als ik Nederlands spreek.: I feel nervous when I speak Dutch.
• Rustig ademen helpt me.: Breathing calmly helps me.
• Ik probeer het gewoon.: I'll just give it a try.

These phrases combine language practice with calming strategies, which can reduce anxiety and support memory formation.

"I used to freeze when someone asked me a question in Dutch. Practicing a few phrases while breathing slowly made it easier to respond without panicking."

What does this mean for language learners?

Testosterone's effect on new brain cell survival is interesting, but it is not a shortcut to memory improvement. For now, the evidence comes from animals, and human memory benefits are unproven. Instead, rely on consistent practice, good sleep, and stress reduction. HypnoDutch's free first week practises this, combining relaxation and breathing with Dutch phrases to help you speak more calmly. You can try it at https://hypnodutch.com/course.