5-Hydroxytryptophan, a precursor of serotonin. Healthy serotonin levels help to regulate sleep, mood, and sugar cravings. Two capsules of this formula contain 100 mg of 5-Hydroxytryptophan and 6.8 mg of Vitamin B6. Thorne's logo, text, trademarks, graphics, videos and photo images are the property of Thorne and are used with permission. Copyright © 2023*FDA Disclaimer: The information about this product and statements made are provided by the manufacturer, except customer reviews which are not evaluated. See www.thorne.com for information about the relationship between this product and any claims made. Results may vary from person to person based on body size and other factors, and the effectiveness is not guaranteed for you. Always seek the advice of your healthcare professional about taking dietary, nutritional, herbal or homeopathic supplements.