If EGCG does not tell you anything, green tea sure does. We have written about green tea in excruciating details, so if you wanna become an expert in the "green tea in skincare" topic, click here and read it.
So now you know that EGCG is the magic ingredient in green tea. It's the most active polyphenol that green tea owes most of its magic properties to. It's a fantastic antioxidant, anti-inflammatory and anticarcinogenic agent. Be happy, if you spot it on the ingredient list.