Yang, Y.Z., et al. «Effect of Astragalus membranaceus on natural killer cell activity and induction with Coxsackie B viral myocarditis,» Chin Med J, 103 (4): 304 - 7, 1990. (chiro.org)
Astragalus (Astragalum membranaceus): Astragalus is another good adaptogen. (mindbodygreen.com)
Zhos, K.S., et al. «Enhancement of the immune response in mice by Astragalus membranaceus extracts,» Immunopharmacol, 20 (3): 225 - 33, 1990. (chiro.org)