Ashwagandha is one of the most studied adaptogens in the world, and one of the few supplements with strong clinical evidence for actually reducing cortisol. But not all ashwagandha is the same. The form, the extraction method, and the dosage make a significant difference in whether a product delivers the results the research shows.
Here's what the science says, and why Thesis Stress Reset uses the Shoden form specifically.
Cortisol is your body's primary stress hormone. In short bursts, it's adaptive, sharpening attention and mobilizing energy for acute challenges. Chronically elevated, it's destructive: it impairs memory consolidation, narrows cognitive flexibility, suppresses immune function, disrupts sleep, and contributes to restlessness and feeling overwhelmed.
Modern life produces chronic cortisol elevation in a lot of people, not from acute threats, but from constant low-grade stressors: deadlines, notifications, financial pressure, and the relentless pace of information. The result is a stress response that never fully switches off.
Ashwagandha works primarily by modulating the HPA axis, the hypothalamic-pituitary-adrenal system that governs the stress response. It reduces the magnitude of cortisol release in response to stressors without blunting the stress response entirely. The result is a more calibrated stress response, appropriate reaction to real challenges, without the chronic background activation that causes cognitive interference.
The active compounds responsible for this effect are withanolides and withaferin A, and their concentration varies enormously depending on the part of the plant used and the extraction method.
Shoden is a patented ashwagandha extract standardized to 35% withanolide glycosides, the highest concentration available in any commercial ashwagandha product. Most ashwagandha extracts are standardized to 5-10% withanolides. The difference in potency is significant.
In a clinical trial published in Medicine, Shoden Ashwagandha reduced cortisol levels by up to 67% and reduced occasional nervousness by 59% compared to placebo. These are among the strongest published results for any adaptogen supplement.
Thesis Stress Reset uses Shoden specifically because the research behind it is more rigorous and the concentration of active compounds is meaningfully higher than standard ashwagandha extracts.
Shoden doesn't work alone in Thesis Stress Reset. It's combined with Zembrin (a clinically studied Kanna extract that supports serotonin regulation and alpha brain wave activity) and fermented Salidrosides from Rhodiola Rosea (which supports cognitive performance under stress and reduces mental fatigue).
Together, these three ingredients address cortisol, mood regulation, and cognitive composure under pressure. 63% of Thesis Stress Reset users report feeling less stressed in open-label consumer studies, the highest result of any Thesis formula.
Does ashwagandha actually reduce cortisol? Yes. Shoden Ashwagandha, the form used in Thesis Stress Reset, is clinically shown to reduce cortisol by up to 67% in a published trial. Standard ashwagandha extracts have weaker evidence, partly because they contain significantly lower concentrations of active withanolides.
What is the best form of ashwagandha for stress? Shoden is standardized to 35% withanolide glycosides, the highest concentration of any commercial ashwagandha extract and the form with the strongest clinical evidence for cortisol reduction. KSM-66 and Sensoril are also well-studied options, but Shoden has the strongest published cortisol data.
How long does ashwagandha take to reduce cortisol? The clinical trial showing Shoden's cortisol reduction results measured effects over 8 weeks of consistent use. Some effects on mood and perceived stress may be noticed within 2-4 weeks. Thesis recommends at least 30 days to assess Stress Reset fairly.
About Thesis: Thesis is a personalized nootropics brand backed by 9 years of research, 7.3 million data points, and 30+ beta tests. 100% vegan, third-party tested, non-GMO. takethesis.com
Results are from open-label consumer perception studies. Individual results may vary. See takethesis.com/pages/science for full study details.
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. Please consult a healthcare professional before starting any supplement. Thesis is for adults aged 18 and older.
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