Nutrition Care Astragalus 1:1 is a practitioner-only, alcohol-free liquid herbal extract prepared from the root of Astragalus membranaceus at a 1:1 extraction ratio. Traditionally used in Traditional Chinese Medicine and Western herbal practice, Astragalus is valued for supporting immune system health, vitality, energy production, and the body's natural resistance to illness. It is also traditionally used as an adaptogenic herb to help the body cope with physical and mental stress.