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More and more research proves that cortisol – the high stress hormone – leads to less testosterone and slower recovery… So it’s no wonder KA-EX® Cortisol Stress Reducer is so popular for athletes and high performers.
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As one of your body’s most powerful stress hormones, cortisol can push your system into constant “survival mode.”
When levels stay high, muscle recovery slows, energy drops, and you hit your limits faster — no matter how perfect your nutrition or training is.
A recent study shows that nearly 50% of high-intensity athletes experience abnormal cortisol regulation, leading to fatigue, reduced performance, and slower recovery.
In other words: elevated cortisol doesn’t just affect how you feel — it limits how far you can go.
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Chronic stress doesn’t just affect mood — it suppresses testosterone and prolongs muscle soreness, which limits strength and endurance.
KA-EX® is the world’s first fast-acting cortisol stress reducer, allowing testosterone and other recovery hormones to rebound so your body can repair stronger.
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If you’ve noticed stubborn midsection fat despite clean eating and training, cortisol is often the culprit.
It signals your body to store fat and burn muscle for fuel… the exact opposite of what high-performers want.
By stabilizing cortisol, KA-EX® supports lean muscle preservation and healthier body composition.
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After intense training sessions, many athletes struggle to fall asleep — even when their bodies are exhausted. That’s often due to elevated cortisol, the stress hormone that keeps the body in “alert mode.”
Night-time cortisol spikes make deep REM sleep nearly impossible — leading to restless nights, groggy mornings, and slower reaction times.
In 3 clinical trials, KA-EX® improved REM sleep by 15%, boosted HRV by 10%, and lowered resting heart rate by 4% — helping athletes finally recover and wake up truly recharged.
Click here to get our FREE 3-pack offer for KA-EX® Cortisol Stress Reducer today →
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Elevated cortisol weakens immunity and connective tissue — increasing injury risk and slowing tissue repair.
KA-EX® is formulated to help reverse these problems by lowering whole-body stress with near immediate effect. It also supports cell recovery so your body stays resilient under heavy training loads.
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“As a holistic recovery product, Ka-Ex is perfect for our riders to give their top performance.“ – Fabian Cancellara,
2x Olympic gold winner
Used by NFL veterans, pro cyclists, and trainers at Equinox and House of Athlete, Ka-Ex® delivers measurable results — including a 36% cortisol reduction within 48 hours.
Each single-serve powder mixes easily into water, with no caffeine, gluten, or lactose.
Start Your 7-Day Cortisol Reset Risk-Free. Notice the difference in your REM sleep, daily energy and HRV patterns, or get your money back.
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Celebrate Our U.S. Launch with the FREE 3-pack offer!
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Celebrate Our U.S. Launch with the FREE 3-pack offer!
4.5 Stars From Hundreds Of Reviews
Cortisol Stress Reducer
Clinically Proven By Three Studies And Backed By 5 Years Of Research, This World-Firsts Fast-Acting Recovery Formula Helps Lower Cortisol -36% Within 48 hours.
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3
6
%
A recent study shows that nearly 50% of high-intensity athletes experience abnormal cortisol regulation, leading to fatigue, reduced performance, and slower recovery.
5
0
%
KA-EX® Welcome Box
15 Servings
$46.99 USD
Unit price
Regular price
$59.99 USD
Sale price
per
Sale
22%
Buy Now & Save
- 15x
- Serving Size
- FREE
- FREE
- Sport Tested:
- Servings (15 days)
- 1 Packet 1oz (28.1g)
- Shipping
- Glas Shaker
- Informed Sport
Cortisol Stress Reducer
Clinically Proven By Three Studies And Backed By 5 Years Of Research, This World-Firsts Fast-Acting Recovery Formula Helps Lower Cortisol -36% Within 48 hours.
-
3
6
%
A recent study shows that nearly 50% of high-intensity athletes experience abnormal cortisol regulation, leading to fatigue, reduced performance, and slower recovery.
5
0
%
KA-EX® Welcome Box
15 Servings
$46.99 USD
Unit price
Regular price
$59.99 USD
Sale price
per
Sale
22%
Buy Now & Save
- 15x
- Serving Size
- FREE
- FREE
- Sport Tested:
- Servings (15 days)
- 1 Packet 1oz (28.1g)
- Shipping
- Glas Shaker
- Informed Sport
Testimonial
Throughout my career, it has always been important to me to stay true to myself. At KA-EX, I’ve found exactly that: high-quality products, a clear vision, and an impressive track record of scientific success that I’m proud to be a part of.
Lara Gut-Behrami
Olympic Gold Medalist 48x World Cup Winner 2x World Champion
I only work with partners who take performance seriously. What impresses me about KA-EX® is its commitment to quality and its clear scientific focus. That aligns with my understanding of professional sports.
Dario Cologna
4x Olympic Gold Medalist 4x Overall World Cup Winner 4x Tour de Ski Winner
Success comes from consistency and the right decisions. KA-EX is a reliable part of my routine to maintain performance and recovery at the highest level.
Claudio Castagnoli
Swiss professional wrestler
As a holistic recovery product, KA-EX® is the perfect complement to offer our riders the best possible conditions for top performance.
Fabian Cancellara
2x Olympic gold medal winner, President Tudor Pro Cycling Team
In the heptathlon, every second and every detail counts. KA-EX helps me perform consistently across every discipline and recover optimally.
Antonia Gmünder
Swiss heptathlete & hurdler
In boxing, speed, focus, and endurance are key. KA-EX helps me perform consistently and recover optimally.
Angelo Pena
Swiss professional boxer
Our team of nutritionists and sports scientists are excited to have a holistic product like KA-EX, supporting us in every recovery process.
Yo Murphy
former NFL Player and VP of Performance at House of Athlete
KA-EX is becoming more and more popular with our players and staff. We instruct players to use KA-EX after every game or practice. We are very happy with the product.
Martin Krone
Head of Physiotherapy, FC Basel
FAQ
What is KA-EX® and how does it work?
Cortisol is the body’s primary stress hormone. It rises in response to physical or emotional stress to help you adapt—but when cortisol stays elevated for too long, it can impair recovery, disrupt sleep, and diminish overall performance.
After intense training, the body enters a prolonged stress state: inflammation, increased acidity, and micro-tears in muscle tissue trigger an extended cortisol response that can last 48 to 72 hours. This often results in low energy, stagnated progress, and—in more severe cases—declining muscular performance.
KA‑EX® is designed to support cortisol normalisation through multiple pathways:
- It contains phosphatidylserine, a clinically studied ingredient associated with supporting the regulation of exercise-induced cortisol responses;
- It supports muscle repair and immune function with L-glutamine, and improves sleep quality with L-tryptophan, both of which help mitigate the effects of elevated cortisol.
- By restoring optimal pH balance and replenishing muscle glycogen through a precise mix of glucose and fructose, KA-EX reduces metabolic stress and accelerates recovery.
Together, these mechanisms help your body return to balance faster—reducing the negative impact of cortisol and unlocking better recovery, sleep, and training results.
In three clinical studies, KA-EX was shown to accelerate cortisol normalization by 36%, improve REM sleep by 16%, and enhance heart rate variability (HRV) by 10%— resulting in more energy (9%) and an 8% mood improvement.
When and how should I take KA-EX®?
KA‑EX® is designed to be taken after physical exercise or activity to support recovery. Since recovery processes last over 48 hours, many athletes also take it on rest days.
KA‑EX® can also be taken on demanding workdays, during periods of mental fatigue, or whenever your body is under stress — whether physical or psychological.
The recommended serving is one KA‑EX® per day, available in either sachet or bottle format. Mix one sachet with 500 ml (approx. 17 oz) of cold water, shake well until fully dissolved, and drink chilled.
Sugar is known to lead to a cortisolspike,why does KA-EX®containsugar?
It’s true that sugar can cause a short-term cortisol spike lasting 30 to 60 minutes. However, in the context of post-exercise recovery, this effect is largely irrelevant.
Intense physical activity elevates cortisol levels for 48 to 72 hours due to muscle damage, inflammation, and systemic stress. In comparison, the brief spike caused by sugar is minimal and does not contribute to any meaningful additional cortisol load.
KA‑EX® contains only 18g of sugar—the same amount and type found in a regular apple (12g fructose, 6g glucose)—and is classified as “low in sugar.” Yet this small amount plays a critical role in the product’s effectiveness by enabling key recovery processes:
- Replenishment of muscle glycogen: Glycogen is the body’s primary fuel source during exercise. Recovery requires energy, and restoring glycogen immediately post-workout is essential for proper muscle repair and performance rebound.
- Facilitated nutrient and electrolyte absorption: Sugar acts as a transport facilitator. As glucose and fructose are taken up into muscle cells, they carry along vital co-transported substances—such as electrolytes, L-glutamine (for cellular repair), anti-inflammatory compounds, and alkaline minerals to restore optimal pH balance.
Research shows that even when the body is adequately supplied with protein and other nutrients, the absence of sugar post-exercise can reduce recovery efficacy by up to 34%. In fact, after high-intensity training, it is often recommended to consume 60g of carbohydrates to support full recovery.
How is KA-EX® different from a regular sports drink or electrolyte mix?
Most sports drinks and electrolyte mixes are designed with a single goal in mind: rehydration. They typically contain water, sodium, potassium, and simple carbohydrates to replace what is lost through sweat during exercise. While these are important, they address only one dimension of what your body needs after intense physical activity.
KA‑EX® is clinically developed and patented in Switzerland as a full-spectrum recovery formula, targeting multiple recovery pathways simultaneously:
- Hormonal recovery: Phosphatidylserine supports regulation of the cortisol response to exercise-induced stress, helping the body return to hormonal balance more efficiently.
- Muscle repair and immune support: L-glutamine plays a central role in muscle repair and immune function, which are compromised following high-intensity exercise.
- Sleep and mood support: L-tryptophan is the dietary precursor to both serotonin and melatonin, supporting the sleep quality that is essential for tissue repair and growth hormone release.
- Antioxidant defence: L-cysteine helps neutralizing the oxidative stress generated by intense exercise.
- Energy and electrolyte restoration: A glucose and fructose combination initiates carbohydrate replenishment, alongside a full electrolyte profile supporting fluid balance, nerve conduction, and muscle contractility.
- Micronutrient support: vitamins B6 and B12 support energy metabolism, while zinc and selenium contribute to immune defense and antioxidant enzyme activity.
Is KA-EX® clinically tested?
In three clinical studies, KA-EX was shown to accelerate cortisol normalization by 36%, improve REM sleep by 16%, and enhance heart rate variability (HRV) by 10%—resulting in more energy (9%) and an 8% improvement in mood.