Withanolides help the body handle stress and settle into a calmer state. They come from Ashwagandha root and a few other plants, where they act as natural steroidal lactones. Most people get them by taking a standardized Ashwagandha extract, not the pure compound.
Human research is still growing, but withanolides seem to nudge cortisol levels toward a healthier rhythm. For the standardized root extract, common intakes land between 300 and 600 mg taken once or twice daily, ideally with food.
Side effects tend to be mild. Stomach upset or drowsiness can happen. Skip withanolide supplements if you are pregnant, nursing, or managing a thyroid condition. People on blood pressure, blood sugar, or thyroid medications should speak with a doctor first.