Green tea extract is possibly safe when taken for up to 2 years or when used as a mouthwash, short-term. Drinking more than 8 cups of green tea daily is possibly unsafe.

Jan 26, 2023 · According to a recent study, although taking high-dose green tea extract for an extended period may offer some protection against cancer, cardiovascular disease, obesity, and type 2 …

Discover the potential dangers of green tea extract and its adverse effects on your health. From liver damage to heart palpitations, learn about the reasons why this popular supplement may not be as …

Jun 30, 2025 · Some case reports have documented serious adverse effects associated with green tea extract supplements. For example, they have been reported to cause liver damage, [1][2][3][4][5] and …

Nov 24, 2025 · Green tea is known for its potential health benefits and may lower the risk of several chronic health conditions. Drinking green tea in very large amounts may raise the risk of …

May 26, 2025 · Green tea extract side effects may include liver damage, insomnia & caffeine withdrawal. Who should avoid it? Can you take it daily? Learn the risks of EGCG & tablets.

Jul 9, 2025 · Drinking green tea in very high amounts can cause headache, nervousness, sleep problems, vomit, diarrhea, irregular heartbeats, dizziness, and convulsions and can be dangerous …

Jun 13, 2025 · Risks arise when tea intake is increased rapidly or when using concentrated extracts that contain EGCG, which can affect the liver and metabolic functions. People with sensitive …

A systematic review of published toxicology and human intervention studies was performed to characterize potential hazards associated with consumption of green tea and its preparations.

Nov 4, 2025 · Overconsumption of concentrated green tea extract can lead to serious health issues, including liver toxicity, digestive distress, and adverse effects from high caffeine levels.