Vitamin C

Despite claims made by some over-the-counter remedies, it doesn’t prevent colds. But once you have symptoms, drink orange or grapefruit juice to help yourself stay hydrated. Your symptoms may not go away any sooner,  but staying hydrated can help you feel better while your symptoms run their course.  Your body also needs vitamin C to help your bones, skin, and muscles grow. You'll get enough by including bell peppers, papaya, strawberries, broccoli, cantaloupe, leafy greens, and other fruits and veggies in your diet.

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Vitamin D

Like calcium, it keeps your bones strong and helps your nerves carry messages. It also plays a role in fighting germs. Careful time in the sun -- 10 to 15 minutes on a clear day, without sunscreen -- is the best source. Or you could eat fish such as salmon, tuna, and mackerel. There's a little in egg yolks, too. You can also get milk and sometimes orange juice with added vitamin D.

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Vitamin E

It’s something called an antioxidant, which protects your cells from damage caused by cigarette smoke, pollution, sunlight, and more. Vitamin E also helps your cells talk to each other and keeps blood moving. Sunflower seeds and nuts including almonds, hazelnuts, and peanuts are good sources. If you’re allergic to those, vegetable oils (like safflower and sunflower), spinach, and broccoli have vitamin E, too.

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Vitamin K

You need it for blood clotting and healthy bones. People who take warfarin, a blood-thinner, have to be careful about what they eat, because vitamin K stops the drug from working. A serving of leafy greens -- like spinach, kale, or broccoli -- will give you more than enough K for the day. A Japanese dish called natto, made from fermented soybeans, has even more.

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Zinc

Without it, you couldn't taste and smell. Your immune system needs it, and it helps cuts, scrapes, and sores heal. It may help you keep your sight as you get older. While you can get zinc from plant sources like sesame and pumpkin seeds, chickpeas, lentils, and cashews, it's easier for your body to absorb it from animal foods, such as oysters, beef, crab, lobster, and pork.

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