A 2026 randomized controlled trial of 12 young men found that taking cordyceps mushroom supplement before intense exercise improved brain reaction speed by about 70 milliseconds after the workout, compared to placebo. According to Gram Research analysis, cordyceps also increased resting oxygen use, though it didn’t change how hard the body could work during peak exercise. The effect is modest and needs confirmation in larger studies before becoming a standard recommendation.
A new study found that taking a cordyceps mushroom supplement before intense exercise may help your brain react faster afterward. Researchers gave 12 young, active men either cordyceps extract or a placebo, then had them cycle as hard as they could. After exercise, the group that took cordyceps showed quicker reaction times on a brain test, though both groups improved. The supplement also slightly increased how much oxygen their bodies used at rest. This suggests cordyceps might give your brain a quick boost during physical activity.
Key Statistics
A 2026 randomized controlled trial of 12 recreationally active young men found that cordyceps supplementation reduced post-exercise reaction time by 70 milliseconds (963.92 ms vs. 1034.33 ms, p = 0.042), representing a medium-sized effect.
According to research reviewed by Gram, cordyceps increased resting oxygen uptake by 54% compared to placebo (0.37 L/min vs. 0.24 L/min, p = 0.022) in a 2026 crossover trial of 12 healthy men.
A 2026 study found that both cordyceps and placebo groups improved reaction time after exhaustive exercise, with placebo improving by 149 milliseconds and cordyceps by 105 milliseconds, suggesting exercise itself sharpens brain speed.
In a 2026 randomized trial, cordyceps did not alter peak exercise oxygen uptake (p = 0.490) or affect blood glucose, blood pressure, or heart rate during or after intense cycling, indicating selective effects on resting metabolism and post-exercise cognition.
The Quick Take
- What they studied: Whether taking cordyceps mushroom supplement before hard exercise helps your brain think faster and improves how your body uses oxygen
- Who participated: 12 healthy young men, average age 21.6 years, who exercise regularly but aren’t professional athletes
- Key finding: After taking cordyceps and exercising hard, men’s brains responded about 70 milliseconds faster on a reaction time test compared to placebo, which is a meaningful difference for brain speed
- What it means for you: Cordyceps might help your brain stay sharp during and after intense workouts, though the effect is modest and more research is needed before making it part of your routine
The Research Details
This was a randomized crossover trial, which means each participant tried both cordyceps and placebo on different days, with a week between tests to wash out the supplement. This design is strong because each person serves as their own comparison, reducing differences between individuals. The researchers used a double-blind approach, meaning neither the participants nor the scientists knew who got cordyceps versus placebo until after the study ended, which prevents bias.
Participants took either 1 gram of cordyceps extract or cornstarch placebo 30 minutes before cycling as hard as they could until exhaustion. The researchers measured how fast their brains reacted using a standard test called the Stroop test, which asks people to identify colors while ignoring conflicting words. They also measured oxygen use, blood sugar, blood pressure, and heart rate before exercise and three minutes after stopping.
This study design is important because cordyceps has been studied in animals and test tubes, but we know very little about how it affects human brains and bodies during real exercise. By testing the same people under both conditions, the researchers could see if cordyceps actually makes a difference beyond what we’d expect from placebo effect or natural variation between people. The crossover design also requires fewer participants while still providing reliable results.
This study has several strengths: it was double-blind and placebo-controlled, which are gold standards for reducing bias; it used a crossover design where each person was their own control; and it measured specific, objective outcomes like reaction time rather than subjective feelings. However, the sample size of 12 men is quite small, which means the results might not apply to everyone. The study only tested young, healthy, recreationally active men, so we don’t know if cordyceps would work the same way for women, older adults, or people with different fitness levels. The study measured only acute (short-term) effects, so we don’t know what happens with regular cordyceps use over weeks or months.
What the Results Show
The main finding was that cordyceps improved how fast people’s brains reacted after hard exercise. On the reaction time test, the cordyceps group responded in about 964 milliseconds after exercise, while the placebo group took about 1,034 milliseconds—a difference of about 70 milliseconds. This difference is statistically significant and represents a medium-sized effect (d = 0.88), meaning it’s a real difference, not just random chance.
Interestingly, both groups got faster at reacting from before to after exercise, which is surprising because you’d expect exhaustion to slow you down. The placebo group improved by about 149 milliseconds, while the cordyceps group improved by about 105 milliseconds. This suggests that exercise itself sharpens your brain’s reaction speed, and cordyceps may add an extra boost on top of that.
Cordyceps also increased how much oxygen people’s bodies used while resting. The cordyceps group used 0.37 liters of oxygen per minute at rest compared to 0.24 liters in the placebo group—a meaningful increase that suggests cordyceps may slightly rev up your metabolism. However, this didn’t translate to using more oxygen during the hardest part of the cycling test, suggesting cordyceps doesn’t help your body work harder during peak exercise.
Accuracy on the reaction time test stayed nearly perfect (above 99%) in both groups, with no difference between cordyceps and placebo. This is important because it shows that the faster reaction times weren’t coming from people just guessing quickly—they were actually thinking faster while staying accurate. Blood sugar, blood pressure, and heart rate showed no significant differences between cordyceps and placebo either before or after exercise, suggesting cordyceps doesn’t dramatically alter these basic body functions during acute use.
According to Gram Research analysis, this is one of the first studies testing cordyceps’ acute effects on human brain function during exercise. Previous research in animals and cells suggested cordyceps might protect nerve cells and improve energy use, but those studies couldn’t tell us if these effects would actually happen in real people doing real exercise. This study provides the first human evidence that cordyceps might have a quick effect on brain speed, though the effect is modest. The finding that cordyceps increases resting oxygen use is new and suggests it may affect how your body produces energy, but more research is needed to understand why this happens.
The biggest limitation is the small sample size of just 12 men. With such a small group, the results might not apply to everyone—we especially don’t know if cordyceps would work the same way for women, older adults, people with different fitness levels, or people with health conditions. The study only tested one dose (1 gram) taken once, so we don’t know if different amounts would work better or worse, or what happens if you take cordyceps regularly over time. The study measured effects only 30 minutes after taking cordyceps and 3 minutes after exercise stopped, so we don’t know how long the effects last or when they peak. Finally, the study used a specific type of cordyceps (Cordyceps militaris) grown in a lab, which may work differently than wild cordyceps or other species.
The Bottom Line
Based on this single study, cordyceps supplementation cannot yet be recommended as a standard practice. The evidence is interesting but preliminary. If you’re curious about trying cordyceps, it appears safe based on this research, but expect only modest effects on reaction speed if any. The dose used was 1 gram taken 30 minutes before exercise. Moderate confidence: This is one small study, so treat it as promising preliminary evidence rather than proven fact.
This research might interest competitive athletes or people who do high-intensity training and want every possible edge, though the benefit is small. It may also interest people studying brain health and natural supplements. People with heart conditions, blood pressure issues, or those taking medications should consult a doctor before trying cordyceps, as this study didn’t test those populations. This research probably doesn’t apply to casual exercisers or people doing light activity.
In this study, the effect appeared within 30 minutes of taking cordyceps and was measured 3 minutes after exercise. We don’t know if the effect builds up over days or weeks of use, or if it stays the same. You wouldn’t expect to feel dramatically different—the improvement was about 70 milliseconds, which is too fast for you to consciously notice.
Frequently Asked Questions
Does cordyceps mushroom actually improve athletic performance?
A 2026 study found cordyceps improved post-exercise reaction time by 70 milliseconds but didn’t increase how hard the body could work during peak exercise. The effect is modest and limited to brain speed, not physical power or endurance.
How long does cordyceps take to work?
In this study, cordyceps was taken 30 minutes before exercise and showed effects 3 minutes after the workout ended. We don’t know how long the effect lasts or if it builds up with regular use over weeks.
Is cordyceps safe to take before workouts?
This study found no significant changes in blood pressure, heart rate, or blood sugar with cordyceps supplementation, suggesting it’s safe for acute use in healthy young adults. However, the study was small and didn’t test people with health conditions.
Can cordyceps help with brain fog during exercise?
A 2026 trial showed cordyceps improved reaction time after hard exercise, suggesting it may help maintain mental sharpness. However, the effect was measured objectively on a test, not subjective brain fog, so individual experiences may vary.
What dose of cordyceps was used in this study?
Participants took 1 gram of standardized cordyceps militaris extract 30 minutes before cycling to exhaustion. This is a single acute dose; the study didn’t test different amounts or long-term daily use.
Want to Apply This Research?
- Track reaction time or cognitive performance on days you take cordyceps versus days you don’t. Use simple reaction time apps or online tests before and after workouts, recording your fastest and average response times in milliseconds.
- If trying cordyceps, take it 30 minutes before your most intense workout of the week, then test your reaction time or mental sharpness 3 minutes after finishing. Log the results to see if you notice a pattern over 4-6 weeks.
- Create a simple spreadsheet tracking: supplement taken (yes/no), workout intensity, reaction time test results, and how mentally sharp you felt. Compare cordyceps weeks to non-cordyceps weeks over 8-12 weeks to see if you notice a personal benefit.
This research describes findings from a single small study in healthy young men and should not be considered medical advice. Cordyceps supplementation has not been proven effective for improving athletic performance or cognitive function in large-scale human trials. Individuals considering cordyceps supplementation, particularly those with cardiovascular conditions, taking medications, or who are pregnant or nursing, should consult a healthcare provider before use. This article is for informational purposes only and does not replace professional medical guidance. The findings may not apply to women, older adults, people with health conditions, or those with different fitness levels.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.