Exercise is the most powerful natural way to improve brain function. Regular physical activity increases BDNF (Brain-Derived Neurotrophic Factor) by up to 300 %, stimulates neurogenesis in the hippocampus and improves executive functions. The right supplements can enhance and prolong these effects.
How exercise affects the brain: the most important mechanisms
BDNF – the brain's fertilizer
Brain-Derived Neurotrophic Factor (BDNF) is the primary explanation for why exercise improves cognition. BDNF is a protein that:
- Stimulates the growth of new neurons (neurogenesis) in the hippocampus – the brain's memory centre
- Strengthens synapses and increases neural plasticity
- Protects existing nerve cells against oxidative damage and apoptosis
- Improves learning speed and memory consolidation
A single aerobic training session of 20–30 minutes acutely increases BDNF by 32 %. Regular cardio training (3–4 times/week) raises baseline BDNF levels by up to 200–300 % compared with being sedentary. A meta-analysis (Szuhany et al., 2015) of 29 studies confirmed that exercise consistently raises BDNF levels.
Increased oxygen supply and neurogenesis
Aerobic exercise increases the heart's stroke volume and improves cerebral blood flow. Research shows that hippocampal volume increases by 2 % in older adults who do aerobic exercise for 1 year (Erickson et al., 2011) – this counteracts the normal age-related shrinkage of 1–2 % per year.
Stress regulation via the HPA axis
Exercise trains the HPA axis (hypothalamic-pituitary-adrenal axis) to handle stress more effectively. Chronic cortisol exposure damages hippocampal neurons and impairs memory. Regular exercise lowers baseline cortisol and makes the cortisol response to stress more controlled.
The best types of exercise for the brain
| Type of exercise | Frequency | Intensity | Primary brain effect |
|---|---|---|---|
| Aerobic cardio | 3–4 times/week | 30–45 min, 60–75% of max heart rate | BDNF, hippocampal volume, blood flow |
| HIIT (interval training) | 2 times/week | 20–30 min high intensity | Maximum BDNF response, executive functions |
| Strength training | 2–3 times/week | 45–60 min | IGF-1, prefrontal cortex, working memory |
| Yoga/balance training | 2–3 times/week | 20–30 min | HPA axis regulation, concentration, stress resilience |
Optimal combination: Aerobic training + strength training gives the best cognitive outcomes in combined studies (Northey et al., 2018, meta-analysis of 333 RCTs).
Supplements that enhance the brain effects of exercise
Lion's Mane – synergy with BDNF via NGF
Lion's Mane (Hericium erinaceus) stimulates Nerve Growth Factor (NGF) – a protein with a similar function to BDNF. Exercise raises BDNF; Lion's Mane raises NGF. The combination gives double neurotrophic support.
The mechanism is complementary: BDNF dominates in the hippocampus and cortex (learning, memory), NGF dominates in the basal ganglia and cholinergic neuronal pathways (attention, motor skills). Studies on Lion's Mane show that 4–8 weeks of intake improves cognitive tests in older adults, and animal studies show that the combination of exercise + Lion's Mane gives a greater increase in neuroplasticity than either alone.
Dose: 1–3 grams/day. Take on an empty stomach, 30–60 min before training, or with breakfast on rest days. Buy Lion's Mane at Tongkatbutiken.
L-Tyrosine – performance under training-related cognitive stress
Intense training depletes catecholamine reserves (dopamine, noradrenaline) and can cause a mental dip after the session – lower motivation, foggy thinking, difficulty focusing. L-Tyrosine replenishes these reserves.
Military studies show that L-Tyrosine improves cognition under physical and mental stress (Deijen et al., 1999; Thomas et al., 1999). One study showed improved working memory in soldiers after 24 hours of sleep deprivation + L-Tyrosine.
Optimal timing: 500–1 000 mg 30–60 minutes after the training session for optimal cognitive recovery. Buy L-Tyrosine at Tongkatbutiken.
NAC – antioxidant protection against exercise-induced oxidative stress
Intense training produces free radicals. In the muscles this is a signal for adaptation; in the brain, oxidative stress can damage neurons if antioxidant capacity does not keep pace. NAC (N-Acetylcysteine) is a precursor to glutathione – the body's most powerful endogenous antioxidant – and crosses the blood-brain barrier.
Dose: 600–1 200 mg/day. Take with a meal, preferably close to your training session. Buy NAC at Tongkatbutiken.
Creatine – an overlooked cognitive effect
Creatine is well known for its effect on muscle strength, but its cognitive effects are just as well documented. The brain uses creatine phosphate (PCr) for rapid ATP synthesis during short cognitive loads.
A meta-analysis (Avgerinos et al., 2018) of 6 double-blind studies showed a significant improvement in short-term memory and intelligence/reasoning with creatine supplementation. The effect is greatest during sleep deprivation and in vegetarians.
Dose: 3–5 grams/day. Take on training days. No loading phase is needed for cognitive effects.
Resveratrol – protects BDNF production via SIRT1
Resveratrol activates SIRT1, an enzyme that regulates mitochondrial biogenesis and is necessary for the BDNF-raising effect of exercise. Studies show that SIRT1 inhibition blocks the cognitive benefits of exercise. Resveratrol thus enhances the neurotrophic signalling of exercise.
Dose: 150–500 mg/day with a fatty meal. Buy Resveratrol at Tongkatbutiken.
Combined effect matrix: exercise + supplements
| Supplement | Mechanism | Time to effect | Synergy with exercise |
|---|---|---|---|
| Lion's Mane | NGF stimulation | 4–8 weeks | Additive to BDNF |
| L-Tyrosine | Dopamine/noradrenaline replenishment | 30–60 min | Post-training cognition |
| NAC | Glutathione/antioxidant | 2–4 weeks | Protects against oxidative damage |
| Creatine | PCr synthesis, ATP reserve | 1–3 weeks | Enhances training performance + cognition |
| Resveratrol | SIRT1 activation, BDNF enhancement | Weeks–months | Enhances the BDNF signalling of exercise |
Weekly plan for brain health
| Day of the week | Training | Supplements |
|---|---|---|
| Monday | Aerobic 30–45 min | Lion's Mane + L-Tyrosine (after) |
| Tuesday | Rest/walk | Lion's Mane + NAC |
| Wednesday | Strength training 45–60 min | Creatine (pre) + L-Tyrosine (after) |
| Thursday | Yoga/balance 20–30 min | Lion's Mane + Resveratrol |
| Friday | HIIT 20–25 min | Creatine (pre) + NAC (after) |
| Saturday | Walk/active rest | Lion's Mane + Resveratrol |
| Sunday | Rest | Lion's Mane |
Research: key studies
- Northey et al. (2018) – meta-analysis of 333 RCTs: exercise significantly improves cognition in adults 50+
- Erickson et al. (2011) – 1 year of aerobic exercise increased hippocampal volume by 2 % in older adults
- Szuhany et al. (2015) – meta-analysis of 29 studies: exercise consistently increases BDNF levels
- Avgerinos et al. (2018) – meta-analysis: creatine improves short-term memory and reasoning
Frequently asked questions about exercise and brain health
How often do I need to exercise to improve my brain?
At least 3 times per week gives measurable cognitive effects. The WHO recommends 150 minutes/week of moderate intensity. Just 20–30 minutes of aerobic exercise gives an acute rise in BDNF and improved focus for the next 1–2 hours.
Which type of exercise gives the best brain effect?
Aerobic exercise (running, cycling, swimming) gives the greatest increase in BDNF and neurogenesis. HIIT maximizes the BDNF response per minute of training. The combination of aerobic + strength training gives the best cognitive outcomes according to meta-analyses.
How quickly do you notice the brain effects of exercise?
Acute: improved focus and working memory 1–2 hours after the session. Short term (2–4 weeks): improved sleep quality and stress resilience. Long term (3–6 months): measurable improvements in memory tests and hippocampal volume.
What is BDNF and why is it important?
BDNF (Brain-Derived Neurotrophic Factor) stimulates neurogenesis, strengthens synapses and protects nerve cells. Exercise increases BDNF by up to 300 %. Low BDNF levels are linked to depression, memory problems and an increased risk of neurodegenerative diseases.
