No, there aren't. I can't remember at what dilution you run up against Avogadro's number, but it's well below 30C. To quote that Wikipedia article for 30C: "Dilution advocated by Hahnemann for most purposes: on average, this would require giving two billion doses per second to six billion people for 4 billion years to deliver a single molecule of the original material to any patient."
In practice, the fact that a herbal remedy at least purports to contain the active ingredient. Homeopathy has a whole load of woo behind it, such that a remedy is supposedly stronger the more dilute it is. As a result, most commercially available homeopathic remedies are so dilute as to contain no active ingredient at all. Supposedly the water in which the active ingredient is diluted retains the "memory" of the active ingredient even when there is no active ingredient. The other main principle of homeopathy is "like cures like". So you give a poison to treat a condition which has similar symptoms to that caused by the poison. So it's a good thing there isn't any actual "medicine" involved.
Unsurprisingly, it performs no better than placebo. The good news is placebo works pretty well for some things.