If you want to lower your cortisol, start with sleep, because a bad night can measurably raise your cortisol the following evening (Leproult, 1997). The four levers that usually pay off most as an athlete are sleep, training dose, breathing or meditation, and caffeine. A cortisol measurement at a fixed moment shows whether your changes have an effect.
I often see athletes chase supplements to tame their cortisol, while the biggest win is usually free. Sleeping better and building in a rest week typically do more than any jar. That is not a popular message, but it is the honest one.
Below I walk through the levers that help most often, each time with the caveat of what measuring does and does not tell you.
Can you really lower your cortisol?
Yes, to some extent you can influence your cortisol, mainly through sleep, recovery and stress management. Cortisol is not an enemy but a recovery hormone with a strong daily rhythm. The goal is not to get it as low as possible, but to keep a healthy pattern that fits your training load.
A chronically raised pattern is what you want to avoid. It creeps in with too little sleep, too much volume and too little real rest.
Measuring helps here, but it is not a goal in itself. You use the value to steer your lifestyle, not the other way around.
Sleep: the biggest lever
Sleep is probably your strongest lever for keeping your cortisol pattern healthy. In a controlled experiment, cortisol the evening after sleep loss was clearly higher than after a normal night (Leproult, 1997). For an athlete already under training stress, that effect counts double.
Think of a simple scenario. You train hard, go to bed after midnight and get up at six for work.
That combination stacks stress on your recovery system. A fixed sleep rhythm and a dark, cool room are boring advice, but they work better for most people than a supplement.
My advice: guard your sleep first, before you adjust anything else.
Dosing training: rest is training too
Too much volume without recovery is one of the most missed causes of a disrupted hormone picture in athletes. In overtraining, researchers often see a disturbed rather than simply raised cortisol pattern (Cadegiani, 2017). So rest is not a luxury, but part of your programme.
A spike after a hard session is normal. Cortisol rises during exercise and drops again afterwards, which is part of a healthy system.
The problem starts if you never truly recover. So build in a lighter week every few weeks, and do not plan your heaviest blocks right before a busy period at work.
Breathing, meditation and relaxation
Calm breathing and meditation can dampen your stress response and are among the few free tools with reasonable research behind them. In a study of students, cortisol dropped after a short mindfulness programme (Turakitwanakan, 2013). It is not about being vague, but about giving your nervous system a break.
You do not need to set aside an hour for it. A few minutes of slow belly breathing after your training can already help you switch off.
See it as a cooldown for your head.
Consistency counts more than duration. Five minutes a day that you keep up do more than an hour you drop after a week.
Movement outside the gym
Alongside your training, calm daily movement can help keep your stress hormones in balance. A review found that regular physical activity is associated with lower cortisol values and better sleep (De Nys, 2022). Think of a walk, not another hard session.
This seems contradictory, because exercise raises cortisol in the moment. The difference sits in intensity and dose.
A calm walk after dinner does not load your recovery, but helps clear your head. For an athlete that is an easy extra lever alongside the hard training.
Caffeine, alcohol and nutrition
What you drink and eat can nudge your cortisol pattern subtly, certainly around your training. Caffeine can briefly amplify your stress response, and alcohol disrupts your sleep, which indirectly presses on your cortisol again. Timing matters more here than a ban.
I am not a fan of rigid rules. An espresso before your training is fine, but a double after eight in the evening can undermine your night rest.
For nutrition the main rule is: eat enough. A too strict diet alongside heavy training is itself a stressor that does not help your recovery.
What your blood value does and does not tell you
A cortisol measurement shows you a snapshot, not a full picture of your stress. Cortisol has a strong daily rhythm, high in the morning and low in the evening, so the timing determines the result. That is why you preferably draw at a fixed moment, usually in the morning.
| Situation | What cortisol shows | What you do with it |
|---|---|---|
| Morning measurement at rest | Your baseline pattern at the start of the day | Follow the trend across several measurements |
| Shortly after a hard training | A temporary spike from exertion | Do not read it as a problem, plan rest |
| After a period of poor sleep | Possibly a higher pattern | Restore your sleep first, then measure again |
| Value within range, still complaints | Reference is broad, your optimum can differ | Discuss the whole picture with your GP |
A single high value after a hard week says little. The trend across several measurements says much more.
If you want to understand what your cortisol says about your stress more broadly, read our pillar on cortisol and stress. If you recognise yourself in a persistently high pattern, look at high cortisol.
When do you measure your cortisol?
Measuring makes sense if you have complaints that fit a disrupted pattern, or if you want to track an adjustment. Then draw at a fixed morning moment, and repeat after a few weeks to build a trend. A loose measurement without comparison is hard to interpret.
According to Thuisarts and the NHG guidelines, a blood test is used in a targeted way for complaints, not as a loose check of everything at once. The RIVM also publishes population figures that help to put your own value in perspective.
For most athletes a broad starting test is a logical beginning. Our 360 Health blood test combines cortisol with other recovery and hormone values in one measurement.
That way you never read cortisol on its own, but next to your other values and your complaints.
Common mistakes when lowering cortisol
Most mistakes sit not in the approach, but in the impatience around it. Anyone who wants to tame their cortisol often runs into the same traps.
The first mistake is chasing supplements while your sleep and recovery are not yet in order. That base almost always pays off more.
The second mistake is measuring too often and being alarmed by every spike. A high value after a hard training is normal, not alarming.
The third mistake is training even harder when you feel tired. With a disrupted hormone picture, more volume is usually exactly wrong.
Frequently asked questions
The questions I get back most from athletes who want to lower their cortisol.
How do you lower cortisol naturally? Start with sleep, training dose, calm breathing and daily light movement. These lifestyle levers pay off most for most athletes, though not every lever works equally well for everyone.
Which blood value do you measure for cortisol? You measure cortisol itself, preferably in the morning at a fixed moment. Because it has a strong daily rhythm, the timing determines the result.
Do I need to fast for a cortisol measurement? For cortisol, fasting is usually not needed, but the timing does count. Preferably draw in the morning, and keep the moment the same if you measure again.
Does exercise lower your cortisol? During exertion, cortisol actually rises. Regular, calm movement is associated with lower values over the longer term, so intensity and dose make the difference.
Do supplements help against high cortisol? The evidence is limited and mixed. I would first address your sleep, recovery and training dose before spending money on jars, and you discuss supplementation with your doctor.
Is high cortisol dangerous for athletes? A temporary spike after training is normal. A long-term raised or disrupted pattern is a signal to look at your recovery and lifestyle, and to consult your GP if complaints persist.
References
- Leproult R, Copinschi G, Buxton O, Van Cauter E. Sleep loss results in an elevation of cortisol levels the next evening. Sleep. 1997. PMID: 9415946.
- Turakitwanakan W, Mekseepralard C, Busarakumtragul P. Effects of mindfulness meditation on serum cortisol of medical students. Journal of the Medical Association of Thailand. 2013. PMID: 23724462.
- Cadegiani FA, Kater CE. Hormonal aspects of overtraining syndrome: a systematic review. BMC Sports Science, Medicine and Rehabilitation. 2017. PMID: 28785411.
- De Nys L, Anderson K, Ofosu EF, et al. The effects of physical activity on cortisol and sleep: A systematic review and meta-analysis. Psychoneuroendocrinology. 2022. PMID: 35777076.
- Thuisarts.nl / NHG. Blood testing. Accessed 2026.
- RIVM. Population figures and reference values. Accessed 2026.
Disclaimer
Every blood test result includes a professional assessment by a BIG-registered doctor. This article gives general information and is not a substitute for medical advice. A blood test is a tool to walk into the conversation with your GP better informed, not a diagnosis in itself. For treatment decisions, discuss your results with your GP.
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