Immune System

Research Notes:
https://www.health.harvard.edu/staying-healthy/how-to-boost-your-immune-system
https://www.healthline.com/nutrition/how-to-boost-immune-health#8.-Manage-your-stress-levels
https://www.medicalnewstoday.com/articles/320101#white-blood-cells
​Journal of American Medical Association (JAMA) 6/30/21