The recommended dosage of green tea extract is between — mg per day. This amount can be obtained from 3—5 cups of green tea, or about 1. Some supplements contain only dry green tea leaves, while others contain isolated forms of one or more catechins. Because supplements are not regulated by the FDA to ensure safety, purity, or verification of contents, you should only purchase supplements that have been analyzed by an independent lab to verify purity and content.
Both exceeding the recommended dose and taking it on an empty stomach may cause serious liver damage 31 , Green tea extract can be consumed in capsule, liquid, or powder form. The recommended dose is — mg, taken with food.
Thanks to its high antioxidant content, green tea extract has been shown to help improve health and body composition. Many studies have shown that green tea extract can promote weight loss, blood sugar regulation, disease prevention, and exercise recovery.
It can also help keep your skin and liver healthy, reduce blood fat levels, regulate blood pressure, and improve brain health. It can be consumed in capsule, liquid, or powder form. Amounts above this may be toxic. Plus, people with diabetes or those taking certain medications should speak with a healthcare professional before taking any amount of green tea extract. Whether you want to improve your general health or decrease your risk of disease, green tea extract is an easy way to add health-boosting antioxidants to your diet.
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Warwick, R. High in antioxidants. May promote heart health. Good for the brain. Can help with weight loss. Might benefit liver function. May reduce the risk of cancer. May be good for the skin. May benefit exercise performance and recovery. May help lower blood sugar. The U. Food and Drug Administration FDA has approved a topical ointment, sinecatechins brand name Veregen , which includes extracted components of green tea leaves and is used for the treatment of genital warts.
How Much Do We Know? Although many studies have been done on green tea and its extracts, definite conclusions cannot yet be reached on whether green tea is helpful for most of the purposes for which it is used. What Have We Learned?
Green tea contains caffeine. Drinking caffeinated beverages throughout the day seems to prevent a decline in alertness. One study looked at the effect of taking only a main component of green tea—EGCG—on mental capabilities. The FDA has approved a specific green tea extract ointment as a prescription drug for treating genital warts. Studies of green tea and cancer in people have had inconsistent results.
The National Cancer Institute does not recommend for or against using green tea to reduce the risk of any type of cancer. A small number of studies suggests that both green and black tea might have beneficial effects on some heart disease risk factors, including blood pressure and cholesterol. The research has limitations though, including how the data was evaluated and differences in study populations, so no definite conclusions have been reached.
The National Center for Complementary and Integrative Health NCCIH is funding research on green tea and its extracts, including studies on new forms of green tea extracts for preventing symptoms of inflammatory bowel disease and for lowering cholesterol. Green tea, when consumed as a beverage, is believed to be safe when used in amounts up to 8 cups per day. Keep in mind that only the amount of added caffeine must be stated on product labels and not the caffeine that naturally occurs in green tea.
Drinking green tea may be safe during pregnancy and while breastfeeding when consumed in amounts up to 6 cups per day no more than about mg of caffeine. Drinking more than this amount during pregnancy may be unsafe and may increase the risk of negative effects. Green tea may also increase the risk of birth defects associated with folic acid deficiency. Caffeine passes into breast milk and can affect a breastfeeding infant. Although uncommon, liver problems have been reported in a number of people who took green tea products, primarily green tea extracts in pill form.
People with liver disease should consult a health care provider before taking products with green tea extract. People taking green tea extracts, especially those with liver disease, should discontinue use and consult a health care provider if they develop symptoms of liver trouble such as abdominal pain, dark urine, or jaundice.
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