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Table 1 summary of long term (≥ 2 weeks) interventional studies with green tea extract

From: Protocol for MInimizing the Risk of Metachronous Adenomas of the CoLorectum with Green Tea Extract (MIRACLE): a randomised controlled trial of green tea extract versus placebo for nutriprevention of metachronous colon adenomas in the elderly population

Study Daily intake of EGCG Duration of trial Sample size Total catechins EGCG ECG EGC EC Caffeine
[38] 300 mg 12 months 60 76% 52% 6% 6% 12% 0.1%
[7] 350 mg 2 months 69 84% Not specified     19%
[31] 800 mg 1 month 8 98% 70%   13% 11%  
[9] 150 mg 12 months 71 20% 11% 2% 7% 0.2% 3%
[39] 225 mg 3 months 64 100% 35% 17% < 1% < 1% 7%
[40] 800 mg 1 month 26 80%-98% 50-75% 12%    2%
[6] 2000 mg 6 months 5 98% 70%   13% 11%  
[2] 300 mg 2 weeks 42 100% 100%