There is an exception to the general rule that supplements won't really help prevent illness, and that's vitamin D (in moderate doses). Research has shown that the immune system needs vitamin D to fight off viruses — while it won't protect you from getting the virus if you're exposed, it could reduce the severity of the illness and help make recovery easier.
You can get vitamin D naturally through sunlight. It's also found in some foods, including fatty fish like salmon, tuna and mackerel, and in small amounts in beef liver, eggs, cheese, and mushrooms.
One of the most evidence-supported ways to stay healthy also happens to be free — getting enough sleep.
That means 7-9 hours each night for most people, according to Harvard Health.
While you're asleep, your body uses that time to do critical recovery and repair of essential functions, including your immune system.
Just one night of poor sleep can reduce your immune cells by as much as 70%, research shows.
Exercise can keep your body functioning well, since research shows that it reduces inflammation and supports infection-fighting cells.
If you're working from home or staying out of the gym, there are plenty of ways to still get your sweat on — body movements like burpees, lunges, push-ups and more can give you a quick full-body workout with no equipment.
As an added bonus, endorphins from exercise also reduce stress.
Stress can also make a big difference for your immune system, particularly when there are alarming or uncertain events happening in the world around you.
Yes, this means managing fears — good strategies include taking breaks from social media and relying on trustworthy media sources for information, both of which can help you avoid panic and misinformation.
How you choose to relax will vary from person to person, whether that's taking a walk outside, curling up with a favorite book, or taking time to meditate or practice yoga or another soothing habit each day.