Do some reading about 'herbal medicines' in the United States.
Rob, thanks for those words of insight.

They are not tested for safety, purity or efficacy.

Some have harmed people permanently.

They have been analyzed sporadically

   Some do not contain the 'herbal' on the label.
   Some contain 'herbals' not on the label.
   Some contain active pharmaceuticals (obviously not on the label.)
   Some contain lead, pesticides or other impurities.

One 'herbal' I know of is a hormone - melatonin. You'll find it among the vitamins and rose hips, but it shouldn't be there at all.

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PDQ, you are doing something quacks do. When someone questions the efficacy of a quack's 'medicine,' the quack starts talking politics instead. For example, when the hawkers of laetrile were challenged, they'd talk about 'freedom of therapy' rather than presenting evidence that laetrile worked. In time people figured out that laetrile was a cruel hoax, and we don't hear about it anymore.

You wrote "People must be free to drink the type of tea they want..."
That sounds sensible, but keep in mind that tea is a certain plant that has been cultivated and drunk for centuries. Putting any old dried plant in hot water doesn't make tea.

Under present U.S. law, I could snip up poison ivy, put it in bags and sell it as it herbal tea.