Sleep, exercise, and diet are the three things that actually strengthen your immune system. Skip the supplements. Movement circulates immune cells, sleep lets your system recharge, and avoiding inflammatory and high-sugar foods keeps immunity from tanking.
Let's step back away from supplements and talk about the big ones. Sleep is huge. Your immune system literally partially recharges while you're asleep. Movement, for a bunch of reasons. Some of those reasons are it actually helps to pump the blood through your immune organs so that you keep your immune cells moving around better. Also, movement of your skeletal muscle sends signals out that induce immunologic triggering to help heal things or fight things. And then the other one that becomes terribly important is is dietary regulation. This basically means don't eat an inflammatory diet, don't eat a high-sugar diet, don't eat a diet high in added chemicals and other junk that your body doesn't need.
