Green tea extract concentrates the active compounds from green tea leaves, especially catechins like EGCG. Each capsule delivers more of these antioxidants than a typical cup of brewed tea.
A modest amount of caffeine supports alertness and mental focus. The extract also promotes metabolism, which is why people include it in weight management routines. Take it with food to avoid stomach upset, and stick to morning or early afternoon so the caffeine does not interfere with sleep.
High doses or taking it on an empty stomach can strain the liver. The catechins may interact with blood thinning medications.