How To Use Ashwagandha To Normalize Cortisol Levels

Understanding the Cortisol Problem

Cortisol gets called the stress hormone, and while that label is accurate, it is also incomplete. Cortisol is not inherently bad. You need it to wake up in the morning, respond to acute challenges, and regulate blood sugar. The problem starts when cortisol stays elevated for extended periods, which is exactly what happens when you are chronically stressed, under-sleeping, or pushing yourself too hard without adequate recovery.

When cortisol remains high around the clock, it starts interfering with nearly every other hormonal system in your body. It suppresses testosterone production, disrupts thyroid function, promotes fat storage around the midsection, breaks down muscle tissue, and impairs immune function. Chronic cortisol elevation is also linked to poor sleep quality, creating a vicious cycle where stress makes you sleep poorly, and poor sleep raises your stress hormones even further.

Dr. Eric Berg dives into how ashwagandha can help normalize cortisol levels, and the key word there is normalize. Ashwagandha does not simply suppress cortisol across the board. It is classified as an adaptogen, meaning it helps your body adapt to stress by modulating the stress response rather than blunting it entirely. If your cortisol is too high, ashwagandha tends to bring it down. If your stress response is dysregulated, it helps restore a healthier pattern. This makes it fundamentally different from pharmaceutical approaches that simply block cortisol production.

How Ashwagandha Works on the Stress Response

Ashwagandha, known scientifically as Withania somnifera, has been used in Ayurvedic medicine for thousands of years. Modern research has started to validate many of the traditional claims, particularly around stress reduction and hormonal support. The active compounds in ashwagandha, called withanolides, appear to modulate the hypothalamic-pituitary-adrenal (HPA) axis, which is the central command system your body uses to manage the stress response.

The HPA axis works like a thermostat for stress hormones. When you encounter a stressor, the hypothalamus signals the pituitary gland, which signals the adrenal glands to release cortisol. Under normal conditions, once the stressor passes, the system dials back down. But with chronic stress, the thermostat essentially gets stuck in the on position. Ashwagandha appears to help recalibrate this system, allowing the HPA axis to respond appropriately to stressors without staying in a perpetually activated state.

Multiple clinical trials support this. In one widely referenced study, participants who took 300 milligrams of ashwagandha root extract twice daily saw a 30 percent reduction in cortisol levels compared to the placebo group over a 60-day period. Other studies have reported similar findings, with participants also noting improvements in subjective measures of stress, anxiety, and overall wellbeing.

The Testosterone Connection

For anyone interested in hormone optimization, the relationship between cortisol and testosterone is critical to understand. These two hormones exist in a seesaw relationship. When cortisol goes up, testosterone tends to go down. This is more than an abstract concept. It is a well-documented physiological relationship driven by the fact that both cortisol and testosterone are synthesized from the same precursor: pregnenolone.

When your body is under chronic stress and demands more cortisol, it diverts more pregnenolone toward cortisol production at the expense of testosterone. This is sometimes called the pregnenolone steal. By bringing cortisol levels back into a healthy range, ashwagandha may indirectly support testosterone production by freeing up more pregnenolone for the testosterone pathway.

Indeed, several studies on ashwagandha have shown modest increases in testosterone alongside cortisol reduction, which is consistent with this mechanism. These are not the kind of dramatic testosterone increases you would see with pharmaceutical intervention, but for men with stress-related hormonal imbalance, the combined effect of lower cortisol and higher testosterone can translate to meaningful improvements in energy, body composition, and mood.

Practical Guide to Ashwagandha Supplementation

Not all ashwagandha supplements are the same. The most well-studied extract is KSM-66, which is a full-spectrum root extract standardized to contain at least five percent withanolides. Sensoril is another branded extract that uses both root and leaf, and it has its own body of research. Both have demonstrated effectiveness in clinical trials, though KSM-66 tends to appear more frequently in testosterone-related studies, while Sensoril shows up more often in anxiety and stress research.

The typical dosing range in clinical studies is 300 to 600 milligrams per day. Some studies use a single daily dose, while others split it into two doses taken with meals. If you are new to ashwagandha, starting at the lower end of the range and assessing your response over two to four weeks is a reasonable approach. Some people notice effects within the first week, while for others it takes longer for the adaptogenic effects to build up.

Timing can make a difference depending on your goals. If you are primarily using ashwagandha for sleep support, taking your dose in the evening may work best. The somnifera in its scientific name literally translates to sleep-inducing. If your focus is more on daytime stress management, a morning dose or split dosing works well. Some people report mild drowsiness at higher doses, so pay attention to how it affects your energy levels and adjust your timing accordingly.

Who Should and Should Not Use Ashwagandha

Ashwagandha is generally well tolerated, but it is not appropriate for everyone. People with autoimmune conditions should exercise caution, as ashwagandha can stimulate the immune system, which could theoretically worsen autoimmune flares. Anyone on thyroid medication should also check with their doctor before starting, as ashwagandha may influence thyroid hormone levels. Pregnant and breastfeeding women are typically advised to avoid it due to insufficient safety data in those populations.

There have been some reports of liver concerns with ashwagandha use, particularly with long-term, high-dose supplementation. While these cases are relatively rare, they have prompted some researchers to recommend periodic breaks from supplementation. A common cycling approach is eight weeks on followed by two to four weeks off, though there is no universally agreed-upon protocol for this.

If you are someone dealing with chronic stress, poor sleep, or stress-related hormonal imbalance, ashwagandha is one of the most well-supported natural options available. It is not going to replace good sleep hygiene, regular exercise, and proper stress management practices. But as part of a full approach to managing your cortisol levels and supporting your hormonal health, it has earned its reputation as one of the more reliable adaptogenic herbs on the market.

The Bottom Line on Cortisol Management

Managing cortisol is not about eliminating it. You need cortisol. The goal is to keep it in a healthy range with appropriate peaks in the morning and a natural decline through the evening. Ashwagandha can help with this, but it works best when paired with the fundamentals: consistent sleep schedules, regular physical activity, adequate nutrition, and deliberate stress management practices. Think of it as a tool that helps your body do what it already knows how to do, just better and more consistently.

Combining Ashwagandha With Other Stress Management Tools

Ashwagandha works best when it is part of a broader stress management strategy rather than carrying the entire load on its own. The most effective cortisol management approaches combine multiple tools that address stress from different angles. Morning sunlight exposure within 30 minutes of waking helps set your circadian cortisol rhythm, producing a healthy peak in the morning that naturally declines throughout the day. This cortisol rhythm is what you want, and it is something that chronic stress disrupts. Getting bright light early helps reset it daily.

Breathwork practices, particularly those that emphasize extended exhalation, activate the parasympathetic nervous system and can reduce cortisol in real time. Even five minutes of deliberate slow breathing with exhales that are longer than your inhales produces a measurable shift in autonomic nervous system balance. Pairing this with ashwagandha supplementation gives you both a biochemical adaptogenic effect and an active daily practice for parasympathetic activation. These approaches are complementary rather than redundant because they work through different mechanisms.

Resistance training deserves special mention in the cortisol conversation. While acute exercise temporarily raises cortisol, which is a normal and healthy response, regular resistance training improves your body is ability to regulate the stress response over time. Men who train consistently tend to have lower resting cortisol levels and faster cortisol recovery after stressful events compared to sedentary men. Combining a consistent training program with ashwagandha supplementation addresses cortisol management from both the lifestyle and supplementation sides simultaneously.

Sleep is the other non-negotiable component. Cortisol and sleep exist in a bidirectional relationship. High cortisol disrupts sleep, and poor sleep raises cortisol. Breaking this cycle requires intentional effort. Ashwagandha taken in the evening may help, given the sleep-supportive properties suggested by its Latin name. But it should be paired with solid sleep hygiene practices: a cool, dark room, consistent sleep and wake times, limiting screen exposure in the hour before bed, and avoiding caffeine after early afternoon. When all of these pieces work together, the impact on cortisol management and overall hormonal health is substantially greater than any single intervention alone.

It is also worth being aware that ashwagandha can interact with certain medications. Because it has mild thyroid-stimulating properties, people on levothyroxine or other thyroid medications should monitor their thyroid levels more closely after starting ashwagandha. It may also interact with sedative medications and immunosuppressants. As with any supplement that has meaningful physiological effects, running it by your healthcare provider before starting, especially if you are on prescription medications, is a sensible precaution that takes minimal effort and can prevent potential complications down the road.