Green tea catechins are a concentrated source of EGCG, the main active compound in green tea. Supplements deliver a consistent dose that is hard to get from brewed tea alone.
EGCG promotes flexible blood vessels and helps maintain cholesterol numbers already in the normal range. It supports the body's natural blood sugar regulation and provides antioxidant defense for immune cells. A mild uptick in metabolic rate makes it a common ingredient in weight management blends.
A typical daily dose is 200 to 500 mg. Always take it with food to cut the chance of stomach irritation. An empty stomach often leads to nausea.
Heads up. Doses over 800 mg per day are tied to rare liver stress. Catechins can lower iron absorption and may amplify blood thinners. Skip it if you are sensitive to caffeine or taking other stimulants.