Green Tea v. Tea Tree

These ingredients have become as ubiquitous as jojoba oil was in the 80's. But I've noticed green tea and tea tree oil turning up in the most unlikely places. While searching for a life-friendly nail hardener, i.e. one that is formaldehyde-free, I found one with green tea extracts. And of course cosmetic companies have been pouring tea tree oil into everything from shampoo to face cream for ages now. Personally, I love it for healing spots and cuts, but the smell doesn't do anything for me. I was surprised to hear that some studies have linked the use of tea tree oil to an increased risk of infection and, somewhat alarmingly, gynecomastia in young boys.