For the most part, every company that sells these kinds of things, all do the same thing. They claim it as a cure all.
Unfortunately, you have some that want a cure for their diseases so bad, that they will try anything. These companies prey on that, and leave many of these folks no better than they found them.
There are cures for things such as Cancer and AIDS, but the actual cure for AIDS (soap, water, and oxygen), would kill a person (if injected into the bloodstream, which would be required) anyway, so not really a cure. Cancer cells, for example, cannot live in an Alkaline environment, and you can create an almost pure Alkaline environment in your body, through the use of dietary changes, dietary suppliments, vitamins, minerals, etc. However, the task of maintaining this state is so tedious that it's not impossible, but rather impractical. Cancer cells thrive in an acidic environment, and absolutely cannot do so in an Alkaline environment. In fact, most infectious cells cannot. This is one of the reasons that old medicine included the act of placing a fish (salmon) under a patient's bare back while sleeping. Of course this only cured superficial things, such as chicken pox, etc.
Since then they have come up with ointments and the like, which if you read the label, contain high Alkaline properties for chicken pox, poison ivy, etc
The FDA gets nothing from vitamins, minerals, or "natural" medicines, because they cannot govern them, meaning they can't approve, or disapprove their use, thus they don't get the million dollar fees, like they do from drug manufactures. So, in return, they don't support the notion or the use of the vitamins, etc as even aiding in someone's health.
I strongly believe that as long as the manufacturing of medicinal products remains a commercial industry, there will never be a "cure" for anything, but rather just temporary relief for them. The reason is, if there is a narcotic cure created for any disease, it would only sell once. Imagine the loss of jobs, if people no longer needed medicine. For example, if they created a medicine that actually killed cancer cells, and cured cancer perminantly, there would be no need for radiation therapy, etc, and thus no need for the technicians that provide the service, etc and the list goes on.
I may sound like a conspiracy theorist here, but I strongly believe it to be logical. I'm not talking about UFO's, etc here. I'm talking about a billion dollar industry that would begin to disolve if cures were made available to the public. It's only logical that they are going to protect their interests, stock holders, etc.
Is it possible that a tea contains healing properties? Of course. What is the likelyhood of every tea they claim to have healing properties, actually having any healing properties whatsoever? Unlikely, because many of the bottlers and manufactures of these vitamin and mineral pills, drinks, etc see the lucrative possibilities of claiming that their product is a cure for x number of diseases. They've turned something possible, and natural into a joke, and improbability, preying on people's natural need to find a cure for what is ailing them. Some ailments are so devastating that people are desperate to try anything, and this is where they get you.