Ashwagandha (Withania somnifera) may indeed slightly improve sleep in some adults, especially those who already have trouble falling asleep or insomnia.
Yes, the link between ashwagandha and cortisol is supported by clinical studies. Several randomized trials and meta-analyses show that taking certain standardized ashwagandha extracts can reduce mean cortisol levels compared to placebo.
Ashwagandha (Withania somnifera) is a medicinal plant most often taken to reduce stress, anxiety, and sleep problems. As of September 2026, the most consistent clinical evidence exists for its use in stress and sleep.
