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What It Does
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Dr. Passero developed Durable ASHWAGANDHA to provide comprehensive support against the wide-ranging negative effects of stress using one of nature’s most trusted adaptogens. Ashwagandha has been used for centuries in Ayurvedic medicine to enhance resilience, calm the nervous system and boost vitality. Today, it’s more essential than ever for counteracting the damaging impact of modern-day stresses.*
This advanced formula delivers a clinically proven 600 mg dose of certified organic KSM-66® ashwagandha—the world’s most extensively studied and trusted ashwagandha extract. Sustainably grown and made using a chemical-free, water-based extraction process, KSM-66® retains the herb’s full spectrum of bioactive compounds in their most potent and bioavailable form and is proven safe for long-term use.*
Backed by over 50 clinical studies, KSM-66® is proven to dramatically lower cortisol by up to 33%, while reducing stress by 64%, anxiety by 76%, and low mood by 77%—all in just 8 weeks or less. It has also been shown to improve sleep, enhance memory and focus, support thyroid balance, and boost energy, endurance and sexual vitality.*
To amplify KSM-66®’s benefits, Durable ASHWAGANDHA includes a powerful 300 mg dose of certified organic Storg-C® amla, a superior source of natural vitamin C, polyphenols and bioflavonoids. Amla nourishes the adrenal glands, strengthens immune function, protects mitochondria and buffers oxidative stress. Together, amla and ashwagandha create a synergistic pairing that supports stress relief and long-term cellular regeneration.*
If you’re feeling overwhelmed, depleted or burnt out, Durable ASHWAGANDHA is your complete solution for lowering cortisol and restoring vitality.*
This synergistic combination of clinically validated, certified organic, adaptogenic ingredients:*
- Lowers cortisol levels by up to 33% in 8 weeks
- Reduces feelings of stress by up to 64% and anxiety by up to 76%
- Enhances mood, memory, focus and mental clarity
- Boosts energy, stamina and cardiovascular endurance
- Promotes deeper, more restorative sleep and improved daytime alertness
- Promotes hormonal balance and sexual vitality in both men and women
- Improves libido, sexual function and satisfaction in women by up to 75%
- Optimizes adrenal function and thyroid health
- Strengthens immune function and fights oxidative stress
General Product Info:
- 60 vegetarian capsules (a 30 day supply)
- Made in the USA in an FDA inspected, cGMP facility
- Every batch is 3rd party tested for safety and purity
- Packaged in premium, non-toxic amber glass bottles
- One-year return policy with free return shipping
Why It Works
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Through more than 20 years of clinical experience, Dr. Passero has found that most of his patients are dealing with some form of ongoing stress that is not being managed properly. And with so many modern stressors—packed schedules, poor sleep, processed foods, unavoidable exposure to toxins, excessive screentime and more—keeping cortisol in check has never been more difficult or more important.*
Ongoing stress triggers prolonged activation of the HPA axis (the body’s stress response system), which leads to persistently high levels of the stress hormone cortisol. Over time, this can impair sleep, digestion, cognitive function, metabolism, heart health, immunity, sexual vitality and hormonal balance. It also taxes the adrenal glands and disrupts thyroid function, often leaving people feeling wired, tired and stuck in a state of burnout.*
That’s why ashwagandha is so essential in today’s world. For thousands of years, it has been one of Ayurvedic medicine’s most powerful adaptogens—herbs that help the body adapt to stress and come back into balance. Now, modern science has confirmed that ashwagandha may be the most effective natural solution for regulating cortisol, calming the nervous system and increasing resilience while enhancing just about every aspect of health.*
KSM-66® Organic Ashwagandha Root Extract: The World’s Most Researched Adaptogen (600 mg)
Dr. Passero developed Durable ASHWAGANDHA to deliver clinically validated, full-spectrum support for stress relief and resilience. At its core is a clinically proven 600 mg dose of KSM-66®—the most trusted and clinically studied ashwagandha extract available today.*
Made exclusively from organically grown ashwagandha root (not leaves), KSM-66® is extracted using a 100% natural, water-based process that preserves the full array of withanolides—one of ashwagandha’s most important active compounds—while eliminating potentially harmful cytotoxins found in leaf-based extracts. KSM-66® contains a potent 5% withanolide concentration and is backed by over 50 clinical trials supporting its safety and efficacy.*
In one landmark double-blind study, adults with chronic stress who took 600 mg of KSM-66® daily for 8 weeks saw a 33% drop in cortisol levels. In another 8-week randomized, double-blind, placebo-controlled clinical trial, KSM-66® lowered cortisol and reduced feelings of stress by 64%, anxiety by 76% and low mood by 77%.*
Other clinical trials show KSM-66® dramatically improves sleep quality and duration, enhances mental clarity, increases energy and stamina, and even improves sexual function in both men and women. One notable study showed KSM-66® improved libido, sexual function and satisfaction in women by 75%.*
KSM-66® also supports optimal thyroid health by balancing the HPA and HPT axes. In adults with low thyroid function, it has been shown to increase Free T3 by 41.5%, normalize TSH and Free T4, and improve overall vitality—all within 8 weeks. (Note: If thyroid health is your primary concern, instead of this formula, consider Durable THYROID, which combines a 600 mg dose of KSM-66® ashwagandha with other thyroid and metabolism supporting ingredients.)*
It’s important to be aware that the purity and safety of ashwagandha extracts varies considerably. Many are 1) not certified organic and 2) made with the leaves of the plant, which are less clinically studied and contain potentially harmful cytotoxins.*
KSM-66® is certified organic, non-GMO, and made exclusively from root material—never leaves—to ensure maximum efficacy and safety. It is the only ashwagandha extract with 45+ quality certifications and a gold-standard safety profile validated across more than 50 clinical trials.*
KSM-66® is the only ashwagandha on the market proven safe for long-term use. It is backed by a recent 12-month safety study that monitored liver and kidney function and adverse events, and found no negative changes, confirming its excellent long-term safety profile.*
Storg-C® Organic Amla: Ancient Adrenal Tonic + Vitamin C Powerhouse (300 mg)
To further enhance resilience and protect the body from the oxidative effects of stress, Durable ASHWAGANDHA also includes a clinically validated 300 mg dose of organic Storg-C® amla extract.*
Amla (Emblica officinalis), or Indian Gooseberry, is another revered adaptogen from Ayurveda known for its rejuvenating, immune-boosting and antioxidant properties. Traditionally paired with ashwagandha, it’s one of the world’s most potent sources of natural vitamin C and is rich in health-promoting polyphenols and bioflavonoids. Amla provides powerful support for immune health and collagen production while buffering oxidative stress throughout the body.*
Amla is especially helpful for nourishing the adrenal glands, which carry the highest concentration of vitamin C in the body. These glands are the key players in regulating stress hormones like cortisol and adrenaline. Amla helps maintain their function, promoting long-term resilience, better hormonal balance and recovery from depletion.*
Storg-C® is standardized to provide 50% organic natural vitamin C, with the other 50% being comprised of antioxidant co-factors including polyphenols and bioflavonoids that enhance vitamin C’s absorption and antioxidant capacity. Studies show Storg-C® offers superior bioavailability and antioxidant protection compared to the synthetic and genetically modified forms of vitamin C found in most supplements. It also supports gut microbiome balance, enhances digestion and protects mitochondria—the energy powerhouses of your cells.*
Together, organic KSM-66® ashwagandha and organic Storg-C® amla create a powerful and pure synergistic formula that helps your body adapt to stress while enhancing sleep quality, mood, mental clarity, energy, hormonal balance and immunity—without unwanted side effects.*
Why We Use Amber Glass Bottles vs. Clear Glass or Plastic
- Glass is infinitely recyclable and reusable.
- Protects the ingredients from UV light damage.
- No risk of chemicals in plastics leaching into pills.
Directions & Label Information
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For adults only. Take 2 capsules daily with food or as directed by your healthcare practitioner. For additional stress support, consider adding Durable MAG COMPLEX to your regimen. For additional sleep support, consider Durable SLEEP.
Clean Formula Guarantee
Non-GMO | Gluten Free | Vegan | Dairy Free | Soy Free | Nut Free | Egg Free | Free of Artificial Colors or Preservatives
Timing of Results
Like most adaptogenic supplements, Durable ASHWAGANDHA will take time and consistent use in order to achieve maximum effectiveness. While individual results may vary, the clinical studies show the best results often begin around 60 days, with results that keep improving over time. Dr. Passero recommends taking Durable ASHWAGANDHA for at least 90 days before evaluating your progress so you can make a proper assessment.
Side Effects & Interactions
Since Durable ASHWAGANDHA is made with 100% natural ingredients, the vast majority of users have no side effects, allergic reactions or interactions. It has no known interactions with most prescription drugs, medications or other dietary supplements.
Cautions
If you are taking medication or have a medical condition, or are pregnant or breastfeeding, consult your healthcare practitioner before use. Keep out of the reach of children.
Contents
Each bottle contains 60 vegetarian capsules (typically a 30 day supply).
Storage
Keep tightly closed in a cool, dry place.
Durable ASHWAGANDHA®
Lowers Cortisol & Restores Vitality
Savings based on 1 bottle price
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What It Does
+
Dr. Passero developed Durable ASHWAGANDHA to provide comprehensive support against the wide-ranging negative effects of stress using one of nature’s most trusted adaptogens. Ashwagandha has been used for centuries in Ayurvedic medicine to enhance resilience, calm the nervous system and boost vitality. Today, it’s more essential than ever for counteracting the damaging impact of modern-day stresses.*
This advanced formula delivers a clinically proven 600 mg dose of certified organic KSM-66® ashwagandha—the world’s most extensively studied and trusted ashwagandha extract. Sustainably grown and made using a chemical-free, water-based extraction process, KSM-66® retains the herb’s full spectrum of bioactive compounds in their most potent and bioavailable form and is proven safe for long-term use.*
Backed by over 50 clinical studies, KSM-66® is proven to dramatically lower cortisol by up to 33%, while reducing stress by 64%, anxiety by 76%, and low mood by 77%—all in just 8 weeks or less. It has also been shown to improve sleep, enhance memory and focus, support thyroid balance, and boost energy, endurance and sexual vitality.*
To amplify KSM-66®’s benefits, Durable ASHWAGANDHA includes a powerful 300 mg dose of certified organic Storg-C® amla, a superior source of natural vitamin C, polyphenols and bioflavonoids. Amla nourishes the adrenal glands, strengthens immune function, protects mitochondria and buffers oxidative stress. Together, amla and ashwagandha create a synergistic pairing that supports stress relief and long-term cellular regeneration.*
If you’re feeling overwhelmed, depleted or burnt out, Durable ASHWAGANDHA is your complete solution for lowering cortisol and restoring vitality.*
This synergistic combination of clinically validated, certified organic, adaptogenic ingredients:*
- Lowers cortisol levels by up to 33% in 8 weeks
- Reduces feelings of stress by up to 64% and anxiety by up to 76%
- Enhances mood, memory, focus and mental clarity
- Boosts energy, stamina and cardiovascular endurance
- Promotes deeper, more restorative sleep and improved daytime alertness
- Promotes hormonal balance and sexual vitality in both men and women
- Improves libido, sexual function and satisfaction in women by up to 75%
- Optimizes adrenal function and thyroid health
- Strengthens immune function and fights oxidative stress
General Product Info:
- 60 vegetarian capsules (a 30 day supply)
- Made in the USA in an FDA inspected, cGMP facility
- Every batch is 3rd party tested for safety and purity
- Packaged in premium, non-toxic amber glass bottles
- One-year return policy with free return shipping
Why It Works
+
Through more than 20 years of clinical experience, Dr. Passero has found that most of his patients are dealing with some form of ongoing stress that is not being managed properly. And with so many modern stressors—packed schedules, poor sleep, processed foods, unavoidable exposure to toxins, excessive screentime and more—keeping cortisol in check has never been more difficult or more important.*
Ongoing stress triggers prolonged activation of the HPA axis (the body’s stress response system), which leads to persistently high levels of the stress hormone cortisol. Over time, this can impair sleep, digestion, cognitive function, metabolism, heart health, immunity, sexual vitality and hormonal balance. It also taxes the adrenal glands and disrupts thyroid function, often leaving people feeling wired, tired and stuck in a state of burnout.*
That’s why ashwagandha is so essential in today’s world. For thousands of years, it has been one of Ayurvedic medicine’s most powerful adaptogens—herbs that help the body adapt to stress and come back into balance. Now, modern science has confirmed that ashwagandha may be the most effective natural solution for regulating cortisol, calming the nervous system and increasing resilience while enhancing just about every aspect of health.*
KSM-66® Organic Ashwagandha Root Extract: The World’s Most Researched Adaptogen (600 mg)
Dr. Passero developed Durable ASHWAGANDHA to deliver clinically validated, full-spectrum support for stress relief and resilience. At its core is a clinically proven 600 mg dose of KSM-66®—the most trusted and clinically studied ashwagandha extract available today.*
Made exclusively from organically grown ashwagandha root (not leaves), KSM-66® is extracted using a 100% natural, water-based process that preserves the full array of withanolides—one of ashwagandha’s most important active compounds—while eliminating potentially harmful cytotoxins found in leaf-based extracts. KSM-66® contains a potent 5% withanolide concentration and is backed by over 50 clinical trials supporting its safety and efficacy.*
In one landmark double-blind study, adults with chronic stress who took 600 mg of KSM-66® daily for 8 weeks saw a 33% drop in cortisol levels. In another 8-week randomized, double-blind, placebo-controlled clinical trial, KSM-66® lowered cortisol and reduced feelings of stress by 64%, anxiety by 76% and low mood by 77%.*
Other clinical trials show KSM-66® dramatically improves sleep quality and duration, enhances mental clarity, increases energy and stamina, and even improves sexual function in both men and women. One notable study showed KSM-66® improved libido, sexual function and satisfaction in women by 75%.*
KSM-66® also supports optimal thyroid health by balancing the HPA and HPT axes. In adults with low thyroid function, it has been shown to increase Free T3 by 41.5%, normalize TSH and Free T4, and improve overall vitality—all within 8 weeks. (Note: If thyroid health is your primary concern, instead of this formula, consider Durable THYROID, which combines a 600 mg dose of KSM-66® ashwagandha with other thyroid and metabolism supporting ingredients.)*
It’s important to be aware that the purity and safety of ashwagandha extracts varies considerably. Many are 1) not certified organic and 2) made with the leaves of the plant, which are less clinically studied and contain potentially harmful cytotoxins.*
KSM-66® is certified organic, non-GMO, and made exclusively from root material—never leaves—to ensure maximum efficacy and safety. It is the only ashwagandha extract with 45+ quality certifications and a gold-standard safety profile validated across more than 50 clinical trials.*
KSM-66® is the only ashwagandha on the market proven safe for long-term use. It is backed by a recent 12-month safety study that monitored liver and kidney function and adverse events, and found no negative changes, confirming its excellent long-term safety profile.*
Storg-C® Organic Amla: Ancient Adrenal Tonic + Vitamin C Powerhouse (300 mg)
To further enhance resilience and protect the body from the oxidative effects of stress, Durable ASHWAGANDHA also includes a clinically validated 300 mg dose of organic Storg-C® amla extract.*
Amla (Emblica officinalis), or Indian Gooseberry, is another revered adaptogen from Ayurveda known for its rejuvenating, immune-boosting and antioxidant properties. Traditionally paired with ashwagandha, it’s one of the world’s most potent sources of natural vitamin C and is rich in health-promoting polyphenols and bioflavonoids. Amla provides powerful support for immune health and collagen production while buffering oxidative stress throughout the body.*
Amla is especially helpful for nourishing the adrenal glands, which carry the highest concentration of vitamin C in the body. These glands are the key players in regulating stress hormones like cortisol and adrenaline. Amla helps maintain their function, promoting long-term resilience, better hormonal balance and recovery from depletion.*
Storg-C® is standardized to provide 50% organic natural vitamin C, with the other 50% being comprised of antioxidant co-factors including polyphenols and bioflavonoids that enhance vitamin C’s absorption and antioxidant capacity. Studies show Storg-C® offers superior bioavailability and antioxidant protection compared to the synthetic and genetically modified forms of vitamin C found in most supplements. It also supports gut microbiome balance, enhances digestion and protects mitochondria—the energy powerhouses of your cells.*
Together, organic KSM-66® ashwagandha and organic Storg-C® amla create a powerful and pure synergistic formula that helps your body adapt to stress while enhancing sleep quality, mood, mental clarity, energy, hormonal balance and immunity—without unwanted side effects.*
Why We Use Amber Glass Bottles vs. Clear Glass or Plastic
- Glass is infinitely recyclable and reusable.
- Protects the ingredients from UV light damage.
- No risk of chemicals in plastics leaching into pills.
Directions & Label Information
+
For adults only. Take 2 capsules daily with food or as directed by your healthcare practitioner. For additional stress support, consider adding Durable MAG COMPLEX to your regimen. For additional sleep support, consider Durable SLEEP.
Clean Formula Guarantee
Non-GMO | Gluten Free | Vegan | Dairy Free | Soy Free | Nut Free | Egg Free | Free of Artificial Colors or Preservatives
Timing of Results
Like most adaptogenic supplements, Durable ASHWAGANDHA will take time and consistent use in order to achieve maximum effectiveness. While individual results may vary, the clinical studies show the best results often begin around 60 days, with results that keep improving over time. Dr. Passero recommends taking Durable ASHWAGANDHA for at least 90 days before evaluating your progress so you can make a proper assessment.
Side Effects & Interactions
Since Durable ASHWAGANDHA is made with 100% natural ingredients, the vast majority of users have no side effects, allergic reactions or interactions. It has no known interactions with most prescription drugs, medications or other dietary supplements.
Cautions
If you are taking medication or have a medical condition, or are pregnant or breastfeeding, consult your healthcare practitioner before use. Keep out of the reach of children.
Contents
Each bottle contains 60 vegetarian capsules (typically a 30 day supply).
Storage
Keep tightly closed in a cool, dry place.

Build Resilience with the World’s Most Trusted Adaptogens
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KSM-66® Organic Ashwagandha
A clinically studied, high-potency root extract shown to reduce cortisol by up to 33%, improve sleep, mood, memory, energy and sexual vitality—all in 8 weeks or less.*
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Storg-C® Organic Amla
A full-spectrum amla extract packed with vitamin C, polyphenols and bioflavonoids to nourish the adrenals, enhance immunity and buffer oxidative stress.*
The Doctor Behind The Formula
Dr. Kevin Passero
Functional Medicine Expert, Licensed Naturopathic Physician and Durable Co-Founder
KSM-66® ashwagandha is one of the botanical ingredients I use most in the clinic with patients. Addressing stress hormones and optimizing sleep are key areas for all aspects of health, and nothing works faster, more safely or better than KSM-66®. Paired with organic amla, it’s the ultimate formula for people who feel burned out, overwhelmed or stuck in stress mode.
