Perfusia-Plus by Thorne is a sustained-release L-arginine formula that improves on the original Perfusia-SR by adding additional nutrients and botanicals. L-arginine is a semi-essential amino acid involved in multiple areas of human physiology and metabolism.Three capsules of Perfusia-Plus contains 1g of sustained-released L-arginine. Perfusia-SR is still available for those who want to use L-arginine by itself.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.