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To maximize GABA concentration, leaves stay in the container for eight to ten hours and are heated above 104 degrees Fahrenheit. The container is then shaken continuously for up to three hours under aerobic conditions (oxygen is reintroduced). These steps may be repeated several times before steaming or rolling, followed by a final drying. As with all tea production, other methods certainly exist.",[16,51,53],{"id":52},"regulatory-standards-in-japan","Regulatory Standards in Japan",[21,55,56],{},"All tea sold as GABA in Japan must meet strict minimum standards. Under Japanese government standards, GABA tea must contain at least 150 milligrams of GABA per 100 grams of tea. Although the discovery is Japanese, most GABA tea available in the US comes from Taiwan, where the process has been enthusiastically adopted along with the tea’s reputed positive effects. 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