Green tea extract is made from green tea leaves. Green tea extracts may be standardized to contain a certain percentage one or more active compounds.
A standardized green tea extract usually contains a guaranteed amount of polyphenols, ECGC, or catechins per milligram of extract. Studies suggest that green tea extract retains the health benefits of green tea, but delivers it in a more concentrated form.
Recent research indicates that green tea extract may be useful for Alzheimer's Disease, memory loss, and preserving memory function. Read more about green tea and Alzheimer's.