GREEN TEA EXTRACT

Green tea extract is derived from the leaves of Camellia sinensis and contains antioxidant and anti-inflammatory compounds. The extract is rich in catechins, primarily epigallocatechin gallate (EGCG), which accounts for most of its identified effects. Green tea extract has been consumed in its natural form for centuries and is now available in concentrated form. Clinical studies have examined its potential role in supporting cardiovascular health, aiding weight management, and reducing cancer risk. Green tea extract is recognised as Generally Recognized as Safe (GRAS) for use in supplements and beverages, though it has not received approval as a pharmaceutical drug. Clinical trials evaluating its use in managing obesity and cardiovascular health have reported outcomes of interest.

Green tea extract is commonly used as a dietary supplement for the following FDA-approved and widely acknowledged purposes: Promoting weight loss and fat metabolism Supporting cardiovascular health by lowering LDL cholesterol Reducing oxidative stress and inflammation Enhancing cognitive function and focus Improving skin health due to its antioxidant properties

Green tea extract is available in various forms, including capsules, tablets, powders, and liquid formulations. The typical dosage ranges from 250 mg to 500 mg of standardised extract (containing 50-90% catechins) per day. It is generally recommended to take green tea extract with food to minimise potential gastrointestinal discomfort. Higher doses should be taken under medical supervision to avoid adverse effects.

Common Side Effects: Nausea or stomach discomfort Headache or dizziness Increased heart rate or palpitations Insomnia or restlessness Serious Side Effects: Hepatotoxicity (rare but possible with high doses) Increased bleeding risk in individuals taking anticoagulants Severe gastrointestinal disturbances in sensitive individuals

Drug Interactions: May interact with blood thinners (warfarin), increasing bleeding risk. Caffeine Sensitivity: Individuals sensitive to caffeine may experience anxiety, palpitations, or insomnia. Iron Absorption: Can interfere with iron absorption; avoid taking with iron supplements or iron-rich meals. Liver Toxicity: Excessive consumption (>800 mg/day) has been linked to rare cases of hepatotoxicity. Pregnancy and Lactation: Not recommended due to potential risks associated with high caffeine intake.

Green tea extract should be used with caution in individuals with pre-existing conditions such as hypertension, heart disease, or anxiety disorders due to its caffeine content. To minimise the risk of liver toxicity, it is advisable to stick to recommended doses and avoid prolonged use of high concentrations. Those with anaemia or gastrointestinal conditions should take it between meals to prevent interference with nutrient absorption. If any adverse reactions occur, discontinuation and consultation with a healthcare provider are advised.

Green tea extract is best taken with meals to minimise gastrointestinal discomfort. Patients using it for weight management should combine supplementation with a healthy diet and regular exercise. Patients with underlying health conditions, particularly liver disorders or cardiovascular issues, should seek guidance from a healthcare provider before commencing supplementation. Do not exceed recommended doses to mitigate potential side effects, especially liver-related complications.

https://www.nccih.nih.gov/health/green-tea https://www.tandfonline.com/doi/abs/10.1080/07315724.2006.10719518 https://www.mdpi.com/1422-0067/21/5/1744 https://www.sciencedirect.com/science/article/abs/pii/009174359290041F