Milk Thistle Tea Bags. Caffeine Free. Native to the Mediterranean region Milk Thistle (Silybum marianum) is indigenous to both western and central Europe and is now found in the United States. An annual or biennial herb growing up to 10 feet tall Milk Thistle has a large bright purple flowering head. It is often considered a pesky weed. It gains its name from the milk white veins that streak its prickly-edged leaves. The plant contains the natural chemical substance Silymarin an active constituent highly concentrated in the fruit but also found in the seeds and leaves. Milk Thistle has been used as both a food and a health aid for hundreds of years. it makes a delicious salad green and cooked vegetable as well as a wholesome tea. For more than 75 years long before it became fashionable Alvita was championing the profound health-giving properties of herbal teas. Alvita travels to the far reaches of the globe for the finest herbs the best growers the most precious sources. Small wonder that so many consumers trust the Alvita name. Today it stands for more than 100 different teas including classic single herb varieties and our unique Alvita blends. The package you hold in your hand combines ancient herbal wisdom with modern science and brings to you all the richness and benefits of herbal teas. This philosophy is the very reason why you will find sensible English pillow style tea bags that are oxygen bleached not chlorine treated. And why you won't find any strings tags or staples. We thank you for choosing our product but more importantly we thank you for the trust you've put in the herbal values that we all share. Alvita. Natural Herb Teas that are Good for You and the Environment.