The science behind one of the most studied herbs in the world — and why it belongs in your daily routine
Ashwagandha has been used in Ayurvedic medicine for nearly 3,000 years. But lately it's moved from ancient remedy to mainstream supplement — and for good reason. The research is catching up to what traditional medicine has known for centuries.
Here's what the science actually says, based on two recent peer-reviewed studies published in 2024 and 2025.
What Is Ashwagandha?
Ashwagandha (Withania somnifera) is a small shrub native to India and Southeast Asia. Its root extract has been the subject of dozens of clinical trials examining its effects on stress, energy, sleep, cognitive function, and physical performance. It's classified as an adaptogen — a natural substance that helps the body adapt to stress and maintain balance.
Stress and Anxiety Relief
This is where the research is strongest. Multiple clinical trials have found that ashwagandha supplementation can meaningfully reduce perceived stress and anxiety levels. Studies show it works by helping regulate cortisol — your body's primary stress hormone — and calming the hypothalamic-pituitary-adrenal (HPA) axis, the system responsible for your stress response.
For adults juggling careers, families, and the demands of everyday life, this is significant. Chronic stress is one of the most common complaints among people 35 and up, and ashwagandha offers a natural, well-researched way to take the edge off without pharmaceuticals.
Better Sleep
Closely tied to stress relief is sleep quality. Research has consistently found that people taking ashwagandha report improvements in sleep — both falling asleep faster and feeling more rested upon waking. This makes sense given its effect on cortisol, since elevated stress hormones are one of the most common culprits behind poor sleep in adults.
Energy and Reduced Fatigue
A 2023 clinical trial found that ashwagandha supplementation produced a statistically significant reduction in fatigue symptoms compared to a placebo group. Participants also showed improvements in heart rate variability — a key marker of how well your body recovers from stress and exertion.
Separately, research has shown that ashwagandha may support better mitochondrial health, which directly affects how efficiently your body produces energy at the cellular level. This helps explain why many people report feeling more sustained energy throughout the day — not a stimulant spike, but a steadier, more consistent baseline.
Physical Performance and Recovery
A 2024 review published in Frontiers in Nutrition found that ashwagandha supplementation is associated with improvements in strength, endurance, power output, and muscle recovery. It also noted benefits related to VO2 max — a measure of cardiovascular fitness — making it relevant not just for gym-goers but for anyone who wants to stay active and feel capable in their body.
For the 35+ adult who isn't necessarily training for a competition but wants to stay strong, recover well, and keep up with life, these findings are meaningful.
Brain Function and Mental Clarity
A 2024 study published in Frontiers in Nutrition examined ashwagandha's effects on brain function, finding evidence of neuroprotective properties and improvements in cognitive performance. A separate 2024 randomized, placebo-controlled study found that ashwagandha root extract improved cognition, energy, and mood in adults who reported struggling with mental fatigue.
This is particularly relevant for people experiencing the kind of brain fog that comes with chronic stress, poor sleep, and the general demands of adult life — which is most of us.
Men's Health
Research has also found that ashwagandha may support healthy testosterone levels in men. A clinical trial focused on overweight, middle-to-older-age men found a significant increase in free testosterone and luteinizing hormone in the group taking ashwagandha compared to the placebo group. For men over 35 concerned about energy, vitality, and hormonal health, this is worth paying attention to.
Is It Safe?
Clinical studies consistently report that ashwagandha is well tolerated at standard doses with few side effects. That said, it's not recommended for pregnant or nursing women, and if you're taking prescription medications or have a thyroid condition, it's worth checking with your healthcare provider before adding it to your routine.
The Bottom Line
Ashwagandha isn't a trend. It's one of the most extensively researched herbs in the world, with a growing body of clinical evidence supporting its benefits for stress, sleep, energy, physical performance, and cognitive function. For real adults who want to feel better across the board — not just in one area — it checks a lot of boxes in a single daily supplement.