Tea extract, particularly green tea extract, has several health benefits. China and other Asian cultures have valued green tea, also known as Camellia sinensis, for its health benefits for 3,000 years, and modern studies have seen promising results. Although green, black, and oolong teas all contain the same healthful substances, green tea contains the highest concentration of powerful antioxidants called polyphenols. Catechins, the major group of polyphenols, are the most beneficial. Green tea extract is available in capsule form; note that the effects of varying doses remain unclear. Talk to your doctor and pharmacist about any herbs and supplements you are taking.
Cancer Prevention
Scientists believe that polyphenols help kill cancerous cells, and stop their progression. Green tea may have the ability to help prevent cancers of the skin, mouth, esophagus, bladder, colon, pancreas, lung, prostate, and breast, although, as of 2010, further research is needed. Studies involving stomach cancer have seen mixed results, with some suggesting green tea decreases the risk, the American Cancer Society notes, and others suggesting it increases risk.
Prevention of Heart Disease
Studies of large groups of people over time and studies that compare groups of people living in different cultures indicate that the antioxidant properties of green tea may help prevent coronary artery disease, the University of Maryland Medical Center reports. Green tea reduces total cholesterol and triglyceride levels, and raises HDL, the so-called good cholesterol. Black tea has similar benefits.
Weight Loss
Several small studies have researched the use of green tea extract for weight loss or weight maintenance, both in overweight and average-weight people. Study results are mixed, and better research is needed, the Mayo Clinic reported in 2010. Research suggests that green tea extract may boost metabolism and help burn fat. The combination of green tea and caffeine was found in one study to improve weight loss and maintenance in overweight and moderately obese individuals.
Arthritis
The catechins in green tea have been seen to reduce inflammation. Research indicates it may benefit arthritis by reducing inflammation and slowing the breakdown of cartilage, the University of Maryland notes. Further studies are needed before a recommendation can be made, the Mayo Clinic added in 2010.
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