What Is Cortisol?
Cortisol is a hormone produced by the adrenal glands, often called the "stress hormone." Although it has a bad reputation, cortisol is vital — it regulates energy metabolism, the immune response and helps the body respond to stress. The problem arises when cortisol is chronically elevated.
📊 Daily Cortisol Rhythm
| Time | Cortisol level | What happens in the body |
|---|---|---|
| 6:00-8:00 (morning) | Highest (peak) | Helps you wake up, mobilizes energy |
| 8:00-12:00 | Gradually decreases | Active period, best time for training |
| 12:00-16:00 | Intermediate | Energy may drop in the afternoon |
| 16:00-20:00 | Low-moderate | Second cortisol surge (lower than the morning one) |
| 20:00-24:00 | Lowest | Preparation for sleep, start of melatonin production |
| 00:00-4:00 | Minimal | Deep sleep, growth hormone peak |
🏋️ Training and Cortisol Balance
⏱️ Training Duration
After 45-60 min. of intense training, cortisol begins to rise sharply. After 90 min., the testosterone-to-cortisol ratio becomes catabolic. Keep training sessions 45-75 min. long.
🔄 Rest Days
Excessive training frequency without rest is the most reliable way to cause chronic cortisol elevation. At minimum 1-2 rest days per week.
🌅 Training Time
Morning workouts (8-11 a.m.) best align with the natural cortisol rhythm. Evening workouts after 8 p.m. can disrupt the decrease in cortisol before sleep.
🔄 Periodization
After 4-6 weeks of intense training, include 1 week of reduced load (deload). This allows cortisol receptors to recover.
🍽️ Nutrition for Cortisol Control
- Carbohydrates after training: 30-50 g of fast carbohydrates after training helps reduce cortisol. Insulin is a cortisol antagonist — the insulin surge caused by carbohydrates suppresses cortisol.
- Enough calories: A calorie deficit greater than 500 kcal/day can increase cortisol. If you are losing weight, do it gradually (0.5-1 kg/week).
- Protein with every meal: 25-35 g of protein every 3-4 hours helps maintain stable blood sugar levels and reduces cortisol surges.
- Omega-3 fatty acids: 2-3 g of EPA/DHA per day can reduce the cortisol response to stress. Salmon, sardines or fish oil supplements.
- Green tea: L-theanine in green tea calms the nervous system and reduces cortisol without causing drowsiness.
💊 Supplements for Cortisol Reduction
| Supplement | Dose | Mechanism of Action |
|---|---|---|
| Ashwagandha (KSM-66 / Sensoril) | 300-600 mg/d | Adaptogen that lowers cortisol. Clinical data show a significant effect within 30-60 days. |
| Rhodiola Rosea | 200-400 mg/d (3% rosavins) | Adaptogen that improves stress resistance and reduces fatigue. |
| Phosphatidylserine | 400-800 mg/d (especially in the evening) | Reduces the cortisol response after training and helps you fall asleep. |
| Magnesium Bisglycinate | 300-400 mg before bed | Calms the nervous system, improves sleep, reduces cortisol. |
| L-theanine | 200-400 mg | Increases alpha brain waves, relaxes without sedation. |
| Vitamin C | 1000-2000 mg/d | The adrenal glands have one of the highest vitamin C concentrations in the body. Helps regulate cortisol production. |
🧘 Lifestyle Strategies
🧘 Meditation
10-20 min. of daily meditation can reduce cortisol within 8 weeks. Apps such as Headspace, Calm or simply breathing exercises.
😴 Sleep 7-8 Hours
Sleep deprivation is a direct cortisol stimulator. One night of insomnia can increase cortisol the next day.
🚶 Walks in Nature
A 20-30 min. walk in a park or forest reduces cortisol. In Japan this is called “Shinrin-yoku” — forest bathing.
📵 Digital Detox
1-2 hours without a phone before sleep improves the rhythm of cortisol secretion. Scrolling social media before sleep is a common source of stress.
🛒 Recommended Products
❓ Frequently Asked Questions
How to Distinguish Normal from Chronic Cortisol Elevation?
Symptoms: constant fatigue, especially in the morning, abdominal fat accumulation despite diet, frequent illnesses (weakened immunity), irritability, sleep disturbances (difficulty falling asleep, but you wake up at 2-3 a.m. at night). If you experience several symptoms for longer than a month — it is worth checking your cortisol level.
Can Cortisol Be Measured at Home?
Yes, there are salivary cortisol tests (4-5 samples per day) that can be done at home. A blood test provides data only for a momentary level, while a salivary test allows assessing the cortisol rhythm throughout the day.
Does Coffee Increase Cortisol?
Yes, caffeine stimulates cortisol release. However, the effect decreases with regular consumption. It is best to drink coffee not immediately after waking up (when cortisol is already high), but after 1-2 hours, when the natural cortisol level drops.