Do consider that herbals have many different chemicals. All natural does not always = healthy. Hemlock, belladonna, rattlesnake venom, all natural. Sure, many herbal remedies work very well. In Germany, my first permanent duty station I worked with a local national pharmacist. There, pharmaceuticals and herbal remedies are both seen equally as medicines.
One red flag, when you see one herbal medication that is supposed to treat a multitude of illnesses with wildly varying etiologies, you should be thinking of a snake oil salesman.
There is no panacea.