What is Green Tea Extract Plus? Our Green Tea Extract Plus tablets are super-concentrated, vegan-friendly green tea tablets that are ideal for giving you a boost of caffeine. These capsules contain green tea extract — a plant extract that’s traditionally grown in China. Every Green Tea Extract Plus tablet is packed with 450mg of green tea extract, along with 36mg of caffeine, and 67.5mg of polyphenols. Discover more from our Myvitamins range here.