Ginger is a knotted, thick, beige underground stem (rhizome). The stem extends roughly 12 inches above ground with long, narrow, ribbed, green leaves, and white or yellowish-green flowers.

What's It Made Of?

The important active components of the ginger root are thought to be volatile oils and pungent phenol compounds (such as gingerols and shogaols).

Medicinal Uses and Indications

Today, ginger root is widely used as a digestive aid for mild stomach upset and is commonly recommended by health care professionals to help prevent or treat nausea and vomiting associated with motion sickness, pregnancy, and cancer chemotherapy. Ginger is used as support in inflammatory conditions such as arthritis, and may even be used in heart disease or cancer.

Motion Sickness

Several studies suggest that ginger may be more effective than placebo in reducing symptoms associated with motion sickness. In one trial of 80 novice sailors (prone to motion sickness), those who took powdered ginger experienced a significant reduction in vomiting and cold sweating compared to those who took placebo. Similar results were found in a study with healthy volunteers. While these results are promising, other studies suggest that ginger is not as effective as medications in reducing symptoms associated with motion sickness. In a small study of volunteers who were given ginger (fresh root and powder form), scopolamine (a medication commonly prescribed for motion sickness), or placebo, those receiving the medication experienced significantly fewer symptoms compared to those who received ginger.

Conventional prescription and non-prescription medicines that decrease nausea may also cause unwanted side effects, such as dry mouth and drowsiness. Given the safety of ginger, many people find it a welcome alternative to these medications to relieve their motion sickness.

Pregnancy Related Nausea and Vomiting

A limited number of human studies suggests that 1 gram daily of ginger may be safe and effective for pregnancy-associated nausea and vomiting when used for short periods (no longer than 4 days). Several studies have found that ginger is more effective than placebo in relieving nausea and vomiting associated with pregnancy. In a small study including 30 pregnant women with severe vomiting, those who ingested 1 gram of ginger every day for four days reported more relief from vomiting than those who received placebo. In a larger study including 70 pregnant women with nausea and vomiting, those who received a similar dosage of ginger felt less nauseous and experienced fewer vomiting episodes than those who received placebo.

Chemotherapy nausea

There is evidence from a few studies that suggests ginger reduces the severity and duration of nausea (but not vomiting) during chemotherapy. Long-term studies should be performed to confirm these results and to establish safety.

Nausea and vomiting following surgery

Research has produced mixed results regarding the use of ginger in the treatment of nausea and vomiting following surgery. In two studies, 1 gram of ginger root before surgery reduced nausea as effectively as a leading medication. In one of these two studies, women who received ginger also required fewer nausea-relieving medications following surgery. Other studies, however, have failed to find the same positive effects. In fact, one study found that ginger may actually increase vomiting following surgery. For this reason, further studies are needed to determine whether ginger is safe and effective for the prevention and treatment of nausea and vomiting following surgery.

Inflammation

In addition to providing relief from nausea and vomiting, ginger extract has long been used in traditional medical practices to decrease inflammation. In fact, many health care professionals today use ginger to help treat health problems associated with inflammation, such as arthritis and ulcerative colitis. In a study of 261 people with osteoarthritis (OA) of the knee, those who received a ginger extract twice daily experienced less pain and required fewer pain-killing medications compared to those who received placebo. Although there have also been a few other studies of the benefit of ginger for arthritis, one trial found that the herb was no more effective than ibuprofen (a medication frequently used to treat OA) or placebo in reducing symptoms of OA.

Other uses

• Although it is much too early to tell if this will benefit those with heart disease, a few preliminary studies suggest that ginger may lower cholesterol and prevent the blood from clotting. Each of these effects may protect the blood vessels from blockage and the damaging effects of blockage such as atherosclerosis, which can lead to a heart attack or stroke.
• Laboratory studies have also found that components in ginger may have anticancer activity. More research needs to be performed to determine the effects of ginger on various cancers in humans.

Available Forms

Ginger products are made from fresh or dried ginger root, or from steam distillation of the oil in the root. The herb is available in extracts, tinctures, capsules, and oils. Fresh ginger root can also be purchased and prepared as a tea. Ginger is also a common cooking spice and can be found in a variety of foods and drinks, including ginger bread, ginger snaps, ginger sticks, and ginger ale.

How to Take It

Pediatric

Ginger should not be used by children under 2 years of age.

Ginger may be used by children over 2 years of age to treat nausea, digestive cramping, and headaches. Adjust the recommended adult dose to account for the child's weight. Most herbal dosages for adults are calculated on the basis of a 150 lb (70 kg) adult. Therefore, if the child weighs 50 lb (20 - 25 kg), the appropriate dose of ginger for this child would be 1/3 of the adult dosage.

Adult

In general, ginger intake should not exceed 4 grams in one day (this includes the ginger obtained through diet such as from ginger ale, ginger snaps, and ginger bread). Usually, food sources contain no more than 0.5% ginger.

Standardized dose: Take 75 - 2,000 mg in divided doses with food, standardized to contain 4% volatile oils or 5% total pungent compounds including 6-gingerol or 6-shogaol.

For nausea, gas, or indigestion: 2 - 4 grams of fresh root daily (0.25 - 1.0 g of powdered root) or 1.5 - 3.0 mL (30 - 90 drops) liquid extract daily. To prevent vomiting, take 1 gram of powdered ginger (1/2 tsp) or its equivalent, every 4 hours as needed (not to exceed 4 doses daily), or 2 ginger capsules (1 gram), 3 times daily. You may also chew a 1/4 oz piece of fresh ginger when needed.

To relieve arthritis pain: Take fresh ginger juice, extract, or tea, 2 - 4 grams daily. Topical ginger oil may also be rubbed into a painful joint. Fresh ginger root may also be placed in a warm poultice or compress and apply to painful areas.

For cold and flu symptoms, sore throat, headache and menstrual cramps: Steep 2 tbsp of freshly shredded ginger in hot water, 2 - 3 times daily. A drop of ginger oil or a few slices of fresh rhizome may also be placed in steaming water and inhaled.

Precautions

The use of herbs is a time-honored approach to strengthening the body and treating disease. Herbs, however, contain components that can trigger side effects and interact with other herbs, supplements, or medications. For these reasons, herbs should be taken with care, under the supervision of a health care provider qualified in the field of botanical medicine.

Side effects associated with ginger are rare, but if taken in excessive doses the herb may cause mild heartburn. Some of the mild gastrointestinal side effects, such as belching, heartburn, or stomach upset, may be relieved by taking ginger supplements in capsules.

People with gallstones should consult a doctor before taking ginger. Make sure to tell your doctor if you are taking ginger and will be going to surgery or placed under anesthesia for any reason.

Do not take ginger if you have a bleeding disorder or if you are taking blood thinning medications, including aspirin.

Possible Interactions

Ginger may alter the effects of some prescription and non-prescription medications. If you are currently being treated with any of the following medications, you should not use ginger without first talking to your health care provider.

Blood-thinning medications -- Although ginger may interfere with blood clotting, there have been no scientific or case reports of interactions between ginger and blood-thinning medications, such as aspirin and warfarin. However, people taking medications that thin the blood should use ginger only under the supervision of a health care provider.

Food Sources

Not all soy protein products contain the same amount of protein. The following list ranks some popular products from greatest amount of soy protein to lowest:

• Soy protein isolate (added to many soy food products, including soy sausage patties and soybean burgers)
• Soy flour
• Whole soybeans
• Tofu

The best way to find out about protein content is to look on the product's Nutrition Facts label to see the percentage of soy protein. Also look at the list of ingredients. If a product contains isolated soy protein (or soy protein isolate), the protein content should be fairly high.

Some products also list how many grams of soy protein are in one serving of the product.

Note: There's a difference between soy supplements (commonly sold in tablets or capsules) and soy protein products. Soy supplements are generally made of concentrated soy isoflavones. These substances may help relieve symptoms of menopause but there is not enough evidence to support using soy isoflavones for any of the other health benefits, such as lowering cholesterol.

Side Effects

For individuals who are not allergic to soy, no serious short-term or long-term side effects have been reported from eating soy foods.

Common mild side effects include stomach aches, constipation, and diarrhea.

Soybeans also contain moderate amounts of a natural substance called purine. Purines can make gout worse. Persons with gout should not eat alot of soy products.

Recommendations

In adults, 25 grams per day of soy protein may reduce the risk of heart disease.

Soy foods and soy-based infant formula are widely used in children, but no studies have shown whether isolated soy protein or isoflavone supplements are useful or safe in this population. Therefore, isolated soy products are not recommended for children at this time.