You've probably heard of dopamine, serotonin, maybe even acetylcholine. But BDNF — brain-derived neurotrophic factor — may be the single most important molecule for your long-term cognitive health, and it rarely makes the headlines. Here's what it does, why it matters, and how to support it naturally.
What Is BDNF?
Brain-derived neurotrophic factor is a protein your brain produces that acts like a growth signal for neurons. It promotes the survival of existing neurons, encourages the growth of new ones, and helps build and strengthen the synaptic connections that underlie learning and memory. In a very literal sense, BDNF is what allows your brain to change, adapt, and improve — a process called neuroplasticity.
The name "neurotrophic" comes from Greek: neuro (nerve) and trophikos (relating to nourishment). BDNF is the brain's primary nourishing protein. It's produced most abundantly in the hippocampus — the brain region most associated with learning, memory consolidation, and emotional regulation. Higher BDNF levels in the hippocampus correlate with better memory performance, improved mood resilience, and a lower risk of neurodegenerative decline. Lower levels are consistently associated with depression, cognitive impairment, and accelerated brain aging.
Think of BDNF the way you'd think of physical training for muscle. Exercise creates the stimulus; BDNF is part of the growth response that actually rebuilds and strengthens the tissue — except in this case, the tissue is your neural network.
Why BDNF Declines — and Why That Matters
BDNF levels naturally decline with age. But the rate of that decline is dramatically influenced by lifestyle factors — many of them under direct personal control. Chronic stress, poor sleep, sedentary behavior, processed food diets high in refined sugars, and excess alcohol consumption all suppress BDNF expression. In contrast, regular aerobic exercise, quality sleep, cognitive challenge, and certain dietary and supplement inputs can powerfully upregulate it.
The clinical implications of low BDNF are serious. Research has linked depressed BDNF signaling to major depressive disorder, anxiety disorders, post-traumatic stress, Alzheimer's disease, and Parkinson's disease. One meta-analysis found that individuals with major depressive disorder had significantly lower serum BDNF levels compared to healthy controls — and antidepressant treatment was associated with a normalization of those levels, suggesting BDNF is mechanistically involved rather than just a correlation.
The flip side is just as meaningful: interventions that raise BDNF don't just protect the brain from decline. They actively improve it. People with higher BDNF levels tend to learn faster, retain information longer, and show more cognitive flexibility under stress.
The Most Effective Natural Ways to Raise BDNF
The research on BDNF enhancement is broad and the evidence is strong in a few key areas:
Aerobic exercise is the most potent known stimulus for BDNF production in humans. A single bout of moderate-to-high intensity cardio — even 20–30 minutes — can acutely elevate circulating BDNF levels. Regular aerobic training produces sustained baseline increases over time. High-intensity interval training (HIIT) appears to produce particularly strong BDNF responses, with some studies showing BDNF increases of 20–30% following HIIT sessions.
Sleep is another non-negotiable. During deep (slow-wave) sleep, the brain consolidates memories and undergoes restorative processes that depend heavily on BDNF signaling. Chronic sleep deprivation — even moderate (less than 6 hours per night) — has been shown to reduce BDNF gene expression. Getting 7–9 hours of quality sleep isn't just rest; it's biological maintenance for your cognitive hardware.
Caloric restriction and intermittent fasting have both been shown in animal models and some human studies to increase BDNF expression, particularly in the hippocampus. The mechanism appears related to reduced insulin signaling and increased expression of SIRT1, a longevity-related protein. Even time-restricted eating windows may offer partial benefit.
Omega-3 fatty acids — specifically DHA (docosahexaenoic acid) — are structural components of neuronal membranes and have been shown in multiple studies to support BDNF production. Epidemiological research consistently links higher dietary omega-3 intake to higher BDNF levels and better long-term cognitive outcomes.
Sunlight and circadian rhythm alignment also play a role. Light exposure stimulates serotonin production, which in turn supports BDNF synthesis. Disrupted circadian rhythms — from irregular sleep schedules, night shift work, or excessive blue light at night — are associated with lower BDNF levels.
The Lion's Mane Connection: A Functional Mushroom That Talks to Your Brain
Of all the natural compounds studied for neurotrophin support, Lion's Mane mushroom (Hericium erinaceus) stands out for its unique and direct mechanism of action.
Lion's Mane contains two classes of bioactive compounds — hericenones (found in the fruiting body) and erinacines (found in the mycelium) — that have been shown in multiple studies to stimulate the synthesis and secretion of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF). Both are neurotrophin proteins that regulate neuron growth, survival, and maintenance.
What makes this especially notable is the mechanism: erinacine C, in particular, has been shown to directly increase BDNF expression in the hippocampus — the same region most vulnerable to age-related decline and most critical for memory formation. A 2023 study published in the Journal of Neurochemistry found that hericerin derivatives from Lion's Mane exert BDNF-like neurotrophic activity in central hippocampal neurons and enhanced spatial memory in animal models, activating the ERK1/2 signaling pathway that BDNF itself uses.
Clinical trials in humans have documented improvements in memory and cognitive performance following consistent Lion's Mane supplementation — with effects typically emerging after 4–8 weeks of daily use and strengthening over time. A 2024 randomized, double-blind, placebo-controlled trial published in Frontiers in Nutrition found that a standardized Lion's Mane extract produced significant improvements in cognition, stress, and mood in healthy young adults after 28 days.
SOLIS by Sunstone California contains 2,500mg of Lion's Mane per serving — a clinically meaningful dose delivered in liquid form using nano-emulsification technology by Splash Nano, which significantly enhances bioavailability compared to standard capsule or powder formats. You can learn more about Lion's Mane's neurological effects in our deep dive: Lion's Mane and Your Brain.
L-Theanine: The Amino Acid That Supports BDNF Through a Different Door
L-Theanine, the amino acid found abundantly in green tea and also present in SOLIS, supports BDNF through a pathway distinct from Lion's Mane's NGF stimulation. Research has shown that L-Theanine can upregulate BDNF protein expression in the hippocampus, with the effect appearing to be associated with enhanced memory consolidation and stress resilience.
L-Theanine also increases alpha brain wave activity — the neural state associated with relaxed alertness, creative thinking, and ease of learning. Alpha states are believed to be particularly conducive to the synaptic consolidation processes that BDNF facilitates. In other words, L-Theanine may both raise BDNF expression and create the brain state in which BDNF's effects are most productively expressed.
This is part of why the combination of L-Theanine with the other active compounds in SOLIS — including Lion's Mane, Alpha GPC, and L-Tyrosine — represents a synergistic approach rather than a single-ingredient intervention. Each compound acts on a different lever of cognitive function, with BDNF support operating in the background as a foundation for the rest.
Explore SOLIS → SOLIS by Sunstone California combines Lion's Mane, L-Theanine, and a full nootropic stack in a 35-calorie sparkling beverage with enhanced bioavailability. Learn more at sunstonecalifornia.com
Other Compounds with BDNF-Supporting Evidence
The research landscape for BDNF support extends beyond mushrooms and L-Theanine. A few other compounds with meaningful evidence include:
- Curcumin (from turmeric) — Multiple animal studies and some human trials have shown curcumin increases BDNF expression, with the caveat that standard curcumin has very poor oral bioavailability; nano-formulated versions show more consistent results.
- Bacopa monnieri — An adaptogenic herb traditionally used in Ayurvedic medicine that has been shown to selectively increase BDNF levels in the hippocampus and prefrontal cortex, with additional evidence for memory improvement in healthy adults and older populations.
- Resveratrol — A polyphenol found in red grapes and berries with evidence for BDNF upregulation, though the research is predominantly in animal models and bioavailability challenges remain.
- Magnesium L-threonate — A specific form of magnesium shown to cross the blood-brain barrier and increase synaptic density, with associated improvements in BDNF-related memory markers.
The common thread across all of these is that BDNF support is not a single-switch intervention. It responds to a system-level approach: consistent aerobic movement, sleep quality, dietary choices, stress management, and targeted supplementation working in concert.
Putting It Together: A Practical BDNF Protocol
If you want to meaningfully support your BDNF levels over time, the most evidence-based approach combines daily aerobic exercise (even 20–30 minutes of elevated heart rate), consistent quality sleep, a diet rich in omega-3s and polyphenols, reduced chronic stress through whatever stress management practices work for you, and targeted supplementation — particularly Lion's Mane and L-Theanine, which have the most direct mechanistic evidence for neurotrophin support.
None of this is dramatic. BDNF responds to the compound interest of healthy daily habits over time. The brain, like muscle, adapts to what it's asked to do — and BDNF is a key part of how it records and builds on that adaptation.
For a deeper look at how the full SOLIS nootropic stack works together — including how Alpha GPC fuels the acetylcholine system that BDNF-grown neurons actually use — see our article: Alpha GPC: The Nootropic Your Brain Uses to Build Sharper Focus. And for the science on why bioavailability matters when supplementing for brain health, check out: Why How You Take Nootropics Matters.
Ready to put the science to work? Try SOLIS by Sunstone California — a functional beverage formulated with Lion's Mane, L-Theanine, and a complete nootropic stack designed for daily cognitive support.
Article Sources
- Ratto, D., et al. (2019). Hericium erinaceus Improves Recognition Memory and Induces Hippocampal and Cerebellar Neurogenesis in Frail Mice during Aging. Nutrients, 11(4), 715. https://doi.org/10.3390/nu11040715
- Limanaqi, F., et al. (2023). Neurotrophic and Neuroprotective Effects of Hericium erinaceus. International Journal of Molecular Sciences, 24(21), 15960. https://doi.org/10.3390/ijms242115960
- Ryu, S., et al. (2021). Hericerin derivatives activates a pan-neurotrophic pathway in central hippocampal neurons converging to ERK1/2 signaling enhancing spatial memory. Journal of Neurochemistry, 158(6), 1157–1169. https://doi.org/10.1111/jnc.15767
- Docherty, S., et al. (2023). The Acute and Chronic Effects of Lion's Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults. Nutrients, 15(22), 4842. https://doi.org/10.3390/nu15224842
- Nathan, P. J., et al. (2006). The neuropharmacology of L-theanine (N-ethyl-L-glutamine): a possible neuroprotective and cognitive enhancing agent. Journal of Herbal Pharmacotherapy, 6(2), 21–30. https://doi.org/10.1300/J157v06n02_02
- Cotman, C. W., & Berchtold, N. C. (2002). Exercise: a behavioral intervention to enhance brain health and plasticity. Trends in Neurosciences, 25(6), 295–301. https://doi.org/10.1016/s0166-2236(02)02143-4
- Castrén, E., & Hen, R. (2013). Neuronal plasticity and antidepressant actions. Trends in Neurosciences, 36(5), 259–267. https://doi.org/10.1016/j.tins.2013.02.005
Medical Disclaimer: This article is for informational and educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease or health condition. The statements in this article have not been evaluated by the Food and Drug Administration. SOLIS is a functional beverage and dietary supplement, not a medical treatment. Always consult a qualified healthcare provider before making changes to your supplementation regimen, especially if you have a pre-existing health condition or take prescription medications.