Finding a cure for the common cold has proved harder than paddling across the Pacific in a rowboat. Experts say that's because colds can be caused by more than 200 different viruses.
There may be no sure way to stop one in its tracks, but some things may work better than others to make you feel better.
Zinc is an essential mineral that's found in almost every cell, and it helps your body resist infection. It also plays an important part in tissue repair. And it may lower the ability of cold viruses to grow on or bind to the lining of your nose.
You can buy zinc as supplement, but it's also found naturally in a number of foods, like:
Researchers report mixed results. One analysis reviewed 15 earlier studies and found that taking zinc through the first few days of a cold, either as a syrup or lozenge, may shorten how long you're sick.
It also appeared to prevent colds in people who used it over the course of about 5 months.
But in other studies, researchers found no differences in symptoms between those who took zinc and those who took a "dummy" pill.
What does this research mean to you and your family? For now, the studies are inconclusive. For every one that shows a benefit with zinc, there's another that finds it doesn't help at all. Many experts say that if there is any advantage in taking zinc, it's minor.
Is It Safe?
Short-term use -- less than 5 days -- doesn't cause serious side effects, but it can make your mouth irritated, leave a metallic taste, or give you an upset stomach.
Experts recommend that you not take zinc for more than 5 days. Long-term use -- more than 6 weeks -- can lead to copper deficiency.
Researchers say zinc nasal sprays cause animals to lose their sense of smell. There have been several reports of people having decreased sense of smell or completely losing it. Because of this risk, the FDA issued a warning to stop using several nasal sprays that contain zinc.
Keep in mind that zinc is necessary for your health and safe to take through food such as seafood and eggs. But supplementing with higher doses, particularly for a long time, can be toxic.