The Most Studied Herbal Supplement for Stress and Sleep
KSM-66 Ashwagandha is backed by 24+ clinical studies — shown to support healthy stress hormone levels, restful sleep, and stress resilience.*
The Stress Problem You Can Feel
You know the feeling: exhausted all day, then wired the moment your head hits the pillow. Your body is tired. Your brain won't stop.
This is the cortisol problem. Cortisol is your main stress hormone. When it stays high — from work, from life, from an overactive nervous system — your body can't shift into rest mode, even when it needs to.
Standard sleep supplements try to make you feel drowsy. But they don't fix the root cause: a stress response stuck in overdrive.
Ashwagandha does something different. As an adaptogen (a plant that helps your body handle stress), it works on the stress response itself — helping your body keep cortisol at healthy levels.[1]*
KSM-66: The Gold Standard in Ashwagandha Research
clinical trial
standardized active compounds
published clinical studies
Not all ashwagandha is the same. KSM-66 is an extract made from the root only. It uses a specific process that concentrates the active compounds — called withanolides — to a standardized 5% level.
In a major clinical trial (randomized, double-blind, placebo-controlled), people taking KSM-66 for 60 days showed much healthier cortisol levels compared to the placebo group.[1]*
The same study showed clear improvements in self-reported stress scores. People reported better sleep quality, less irritability, and better focus.*
Sensoril is another well-studied form that uses both root and leaf, giving it higher active compound levels. Both forms have strong research behind them, but they fit slightly different profiles.*
How Lower Stress Hormones Change Your Sleep
The connection between cortisol and sleep is direct — it's the reason you can't relax at night.
Cortisol naturally peaks in the morning and should drop through the day, reaching its lowest at bedtime. When ongoing stress keeps cortisol high at night, it blocks melatonin production and stops your body from shifting into sleep mode.[2]*
A sleep-focused study using ashwagandha root extract showed that the treatment group slept better, fell asleep faster, and slept longer compared to the placebo group.[3]*
The results were strongest in people who reported high stress — suggesting ashwagandha's sleep benefits are most clear when stress is the thing driving the sleep problem.*
Generic Ashwagandha Is a Gamble
The supplement market is full of generic ashwagandha powder — ground root with no standardization, no verified active compound content, and wildly uneven strength.
The research behind ashwagandha's benefits is tied to standardized extracts at specific doses. Generic powder may contain a small fraction of the active compounds, or may include fillers that water down the effective dose.
Standardized Extracts Only
Formulai only carries KSM-66 and Sensoril ashwagandha — the two most tested and proven extracts with verified active compound levels.
Research-Level Dosing
Products deliver 300-600mg of standardized extract — the dose range used in published clinical trials.
Heavy Metal Tested
Ashwagandha is a root crop that can absorb heavy metals from soil. Every product is tested for lead, arsenic, mercury, and cadmium.
Find Your Perfect Ashwagandha
You've got two paths:
Path A: Keep fighting high stress hormones with generic supplements that may not contain what they claim.
Path B: Take 60 seconds to find a standardized, research-dosed ashwagandha product matched to your stress and sleep profile.
Formulai's assessment is free, science-backed, and only includes products with verified KSM-66 or Sensoril sourcing.
Fast results. Science-backed. Personalized for you.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.