One of the most potent plant treatments isn't in your first-aid kit but on your spice rack. Dried or fresh, common culinary thyme contains high levels of antimicrobial compounds that combat colds and flus as well as expectorant properties that can help tame coughs. Try this unsung fix the next time you're feeling under the weather.

Where to Find It
Pick up dried and fresh thyme at most grocery stores. Dried herbs lose their potency over time; when the herb no longer has its fragrant scent, pick up a new jar.

How to Use It
Pour a cup of boiling water over 2 teaspoons dried (or 3 teaspoons fresh) thyme, and steep for 10 minutes. Drink 3 cups daily for cold, flu, and cough symptoms. Gargling with the tea can also help ease a sore throat.