Could you tell me what are side effects of drinking green tea extreme?

See details: The most likely issues are those related to high caffeine intake. Palpitations, agitation, nervousness, etc.

Diet pills: Green Tea Extreme diet supplement - although I don't know this specific product , overdose of Green Tea (usually extract) may lead to irritability, insomnia, irregular or rapid heart rate, muscle twitching, nausea, vomiting, diarrhea, abdominal cramps, liver damage, trouble breathing, dizziness, fever, confusion, hallucinations, diuresis, seizures, loss of consciousness & even death.