The FDA has been threatening to regulate herb, plant medicines, herbal preparations, and supplements since the 1980s at least. So far the worst they’ve done is propagate the lie that comfrey shouldn’t be used internally. They’ve done a few other things, but nothing devastating. If you grow your own, it’s not their problem and none of their business. If you can’t grow it, find a source for the plant material you need and appropriate for the type of preparation you will be doing. Just having a stash of dried herbs may do you no good if dried plant material doesn’t make medicine.
I am working on a medicinal garden. I grow echinacea, chamomile, lemon balm. I have dried plantain. I have a long way to go but I am working on it. I save my uncooked eggshells, grind them into a powder and make my own calcium tablets and also make my own turmeric capsules as is more economical. I haven’t grown feverfew as of yet but I do buy feverfew capsules and that is my first go to for pain mgmt.