10 Best Healing Herbs

New science shows these herbal power-healers can ease pain, prevent Alzheimer's, and ward off cancer and heart disease. Try 3 natural wonders you haven't heard of yet.

By Nancy Kalish, Prevention

Turmeric

Ease arthritis

A heaping helping of curry could relieve your pain. That's because turmeric, a spice used in curry, contains curcumin, a powerful anti-inflammatory that works similarly to Cox-2 inhibitors, drugs that reduce the Cox-2 enzyme that causes the pain and swelling of arthritis, says Lee.

Cinnamon

Lower blood sugar

In a recent German study of type 2 diabetics, taking cinnamon extract daily successfully reduced blood sugar by about 10%.

It might also: Lower cholesterol. Cinnamon packs a one-two punch for people with type 2 diabetes by reducing related heart risks. In another study of diabetics, it slashed cholesterol by 13% and triglycerides by 23%.

Rosemary

Avoid carcinogens

Frying, broiling, or grilling meats at high temperatures creates HCAs (heterocyclic amines), potent carcinogens implicated in several cancers. But HCA levels are significantly reduced when rosemary extract (a common powder) is mixed into beef before cooking, say Kansas State University researchers. "Rosemary contains carnosol and rosemarinic acid, two powerful antioxidants that destroy the HCAs," explains lead researcher J. Scott Smith, PhD.

Ginger

Avert nausea

Ginger can prevent stomach upset from many sources, including pregnancy, motion sickness, and chemotherapy. "This is one of Mom's remedies that really works," says Suzanna M. Zick, ND, MPH, a research investigator at the University of Michigan. A powerful antioxidant, ginger works by blocking the effects of serotonin, a chemical produced by both the brain and stomach when you're nauseated, and by stopping the production of free radicals, another cause of upset in your stomach. In one study of cruise ship passengers traveling on rough seas, 500 mg of ginger every 4 hours was as effective as Dramamine, the commonly used OTC motion-sickness medication. In another study, where subjects took 940 mg, it was even more effective than the drug.

Holy Basil

Combat stress

Several animal studies back holy basil, a special variety of the plant you use in your pesto sauce, as effective at reducing stress by increasing adrenaline and noradrenaline and decreasing serotonin. This is no surprise to Pratima Nangia-Makker, PhD, a researcher at the Barbara Ann Karmanos Cancer Institute in Detroit, whose mother and grandmother relied on a tea made from the leaves of holy basil to relieve indigestion and headaches.

St. John's Wort

Soothe your worries

You probably know that research has confirmed this herb's power to relieve mild to moderate depression and anxiety as effectively as many drugs without a lot of the side effects.

Garlic

Lower cancer risk

High consumption of garlic lowered rates of ovarian, colorectal, and other cancers, says a 2006 research review in the American Journal of Clinical Nutrition. A 2006 Japanese clinical trial also found that after a year of taking aged garlic extract supplements, people with a history of colon polyps saw a reduction in the size and number of the precancerous growths detected by their doctors.

Andrographis

Shorten Summer Colds

Andrographis does a great job of relieving upper-respiratory infections, such as colds or sinusitis, says new research. A study in the journal Phytomedicine reported that the herb eased symptoms such as fatigue, sleeplessness, sore throat, and runny nose up to 90%.

Sea Buckthorn

Reverse vaginal dryness

Sea buckthorn (Hippophae rhamnoides) is very effective for hydrating mucous membranes and alleviating vaginal dryness. It contains palmitoleic acid, a fatty acid found in human skin that helps moisturize and heal it.

Kudzu

Curb problem drinking

A group of moderately heavy drinkers in their 20s voluntarily cut their beer consumption in half after taking capsules containing the Chinese herb (also called Pueraria lobata) for a week, according to a study published in Alcoholism: Clinical and Experimental Research. Researchers say the kudzu more quickly allows alcohol to get to the part of the brain that tells you that you've had enough.