This is just a more concentrated form of green tea. Cha is the Chinese word for tea. Also Japanese. (Chai, which everyone thinks is tea mixed with milk, is actually just the Indian word for tea). Because it's more concentrated it has more of what is good about green tea and also more of what might not agree with you. Everything has its ups and downs. So it has more caffeine than other forms of green tea, but more theanine, a relaxant, and antioxidants as well. If you overdo it, you'll overdo the caffeine and as with anything, you might contraindicate something else you're taking. It's not a miracle food. It's a beneficial food. If you eat collard greens, which are really good for you, you get benefits. If you eat ten pounds of them, you probably will get a stomach ache. You might want to look into white tea -- it's said to have an even better antioxidant profile than green tea.
I find it curious that it made it into my insurance companies mass email.
I'm on Medicare, too, but have a supplemental policy as well. The company I have my supplement with is always sending me "tips" that are supposed to be healthy also. I don't know where they get their information or who writes the articles they put in their e-mails because I think they often have information that isn't the best or that might contain "fad" diets, etc.
Even though information comes from my insurance company, I research whatever I think I might want to try to make sure it has science behind it.
I have tried every kind of detox you can think of! Time and time again, they never really worked!
I tied, after much trial and error I found something that really works, so I am very happy!
I've had matcha tea at a local tea shop (we have some trendy and very involved ones in the Portland area). It's not my fave for flavor, it reminds me of spinach. Not that I don't love spinach, but I don't want it in my tea water.