The phrase "system booster" refers to something that can enhance or improve a system's performance, efficiency, or functionality. It helps the system work better or faster. Full definition
It is the most potent natural immune system booster known to science. (naturemoms.com)
Include the following 15 immune system boosters in your recipes and meal planning, and you'll help your family fight off those winter bugs. (healthline.com)
Additionally, this can also act as a natural immune system booster because it is packed with vitamins and minerals. (puppywire.com)