CHINA GREEN TEA contains caffeine and EGCg, both potentially dangerous in large quantities. Although it’s quite difficult to reach those levels by drinking home-brewed green tea, it doesn’t mean you shouldn’t be careful.

A safe dose of EGCg per day is around 500 mg per day. Amounts higher than 800 mg per day taken for 4 months may influence the liver,[1] especially in people with higher BMI. Most cases of liver damage caused by EGCg were actually related to green tea supplements taken for weight loss goals, rather than traditionally brewed tea. Liver damage caused by drinking a few cups of green tea per day is, in fact, very rare. A cup of green tea can have anywhere from 2.3-203 mg of EGCg per 100 grams of drink[2], which is a very wide range. Therefore, 3-5 cups of green tea daily will very likely be a safe dose. You can increase the recommended dose by using the multiple-steeping technique. Dangerous high doses are usually available only in supplements.

The second potentially dangerous substance in green tea is caffeine. All green teas contain caffeine, but levels in some of them might be low. A cup of green tea can have anywhere from 10 to over 100 mg of caffeine per cup. Roasted mature leaves like bancha will have less caffeine than fresh shaded steamed teas like gyokuro. Gyokuro is superior to most black teas in terms of awakening effect. Safe dose for a healthy individual is around 400 mg of caffeine per day, a level rarely met by drinking 3-5 cups of only green tea daily.

Both EGCg and caffeine need a certain temperature and steeping time to be extracted into water. That means that you will never get the full amount of caffeine and EGCg from the leaves. You can reduce the levels by using cooler water and shorter steeping time or increase them by using boiling water and infusing leaves for a very long time. This, however, will not be pleasant to drink at all.

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