Green Tea extract is one of the most popular ingredients in high quality diet pills
Green Tea (Camellia Sinensis) is extracted from an ever green shrub, found with thick dark green leaves. The green tea shrub itself is usually harvested at heights of eight feet. Green tea
is now found in Asia, Africa, and aspects of the Middle East. Besides popular information, Green teas, Black teas, and Oolong teas come from the same shrub. The difference between each is independent upon the extracting methods used. For example, Green tea is picked; the leaves are then rolled and dried. Black tea is processed the same way, except the tea leaves are fermented before they are dried, which causes them to change black and to deliver a different flavor.
Green tea has been offered for 1000s of years as a drink and therapeutic agent. In countries such as Japan and China, the consuming of teas has remained a commonality among the people of these countries. Most traditional uses of Green tea is focused on ritual, but has been used as a universal body tonic; used to revive one's mind and to provide energy for life.
Today, Green tea is utlized because of its superior antioxidant activity and harnesses the potential to treat and fight many diseases, especially cancer. The primary constituents of Green tea that lend to its high antioxidant activity are the polyphenols. The most well known polyphenols are: catechins and gallocatechins. Polyphenols are one subgroup of a major classification of molecules known as flavonoids. Flavonoids are well known for their antioxidant power.
Green tea also delivers several other properties, such as tannins, that allow it to be a useful remedy for diarrhea. It also contains caffeine, vitamins, and minerals. Although not as high as amounts the amount found in coffee, the caffeine in Green tea has been shown to stimulate the central nervous system.
Why use Green Tea Extract
Green tea is most utlized for its cancer fighting and potential treatment action. Green tea is anti-mutagenic and anti-carcinogenic. It has also exhibited anti-neoplastic properties for most tumor cell lines in a Petri dish and animal research.
Human research have demonstrated that Green Tea can lower the risk of cancer in smokers by decreasing the oxidative damage to cells. Green tea has significant antioxidant activity, engulfing free radicals that can lead to several types of cancers.
Green tea may support an adjunctive treatment for prostate cancer. It can reduce the PSA - a tumor marker used to monitor the progression and growth of prostate cancer. Green tea may also prevent colorectal cancer by decreasing the amount of inflammatory mediators present in the cells.
Green tea is an effective treatment, both topically and orally for cervical lesions. It may be cancer preventative due to its ability to regress cervical dysplasia of the mild and moderate type. Green tea may also be effective against lesions caused by the Human Papilloma Virus, a virus that is known to contribute to the development of cancer of the cervix and vulva.
Green tea is considered a cardioprotective botanical. In study, it has been shown to decrease levels of LDL, or bad cholesterol levels, in the blood.  Green tea can also protect against the oxidation of LDL because of its powerful antioxidant activity. This can assists in preventing the development of atherosclerosis, a deadly disease characterized by the hardening and narrowing of arteries.
Green tea may also prevent dental cavities. It is anti-inflammatory on the tissues of the mouth. The constituents found within Green tea also lend antibacterial activity, and may be effective at combating several of the most common bacteria known to cause dental cavities and infections of the gums; including E.coli, staph, and strep.
Green tea has also recently been recognized for its ability to increase the metabolism of fat and decrease weight. Green tea is thermogenic in nature; increasing the oxidation of fat molecules in the body . It may prove helpful in persons suffering from obesity and are trying to lose weight.
Green tea has also been shown to protect the skin from damage caused by UV exposure.  This may be particularly relevant for individuals who are sensitive to UV light, as well as in those at an elevated risk for developing skin cancer.
Green Tea Dosages
Different dosages of Green tea are used, and are considered dependant upon individual need. For daily antioxidant intake, 1 - 2 teaspoons of tea (3g of soluble components), steeped in 1 cup of water may be sufficient. This beverage can be drunk 1 - 4 times a day.
Higher dosages can be taken in capsule form to increase ones protection potential cancer development. The recommended dosage for this delivery forms ranges from 300 - 400 milligrams of polyphenols per day. Most of the Green tea supplements available in capsule form will be standardized to 80% total polyphenols or 55% epigallocatechin.
Worth mentioning, dosages as high as 800 mg of epigallocatechin or polyphenols have been taken per day for cancer prevention. These doses are safe, but do produce some side effects.
Green Tea Toxicities and Contraindications
Side effects from the administration of increased dosages of Green tea or Green tea extracts include; excess gas, upset stomach, nausea, heartburn, abdominal pain, dizziness, headache, and muscle pain. The excessive ingestion of Green tea can also result in CNS symptoms of anxiety, restlessness, jitters, and insomnia; primarily caused by caffeine content.
Green tea is thought to be safe in all populations, though its use in women who are pregnant or nursing should be limited because of the effects of caffeine on the developing baby.
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