What they do: Probiotics are predominantly known for keeping our guts healthy and regulating our digestive system, but one of their added benefits is immune health. Our gut walls make up 70 percent to 80 percent of our immune system, which means their overall health lessens the immune system's chances of being compromised. "Probiotics can reduce the risk of colds compared to placebo," Dr. Mafi told POPSUGAR.
Where to find them: Yoghurt, kombucha, sauerkraut, kimchi, and kefir are all good sources of probiotics.