George--of course you may do whatever you think is best for your own health, but if your hesitation is that the remedy may have a toxic effect, you needn't be concerned.

If it is a homeopathic remedy, the amount of arnica that you'd get is considerably less than a drop, in fact less than a hundredth of a drop--more likely a thousandth or even a ten thousandth of a drop, diluted repeatedly according to a carefully standardized procedure--the amount of the actual remedy is infinitessimal, which is why a) it can be sold over the counter as an oral remedy, and b) why many people have trouble believing that it is an effective treatment--

The remedies are safe and inexpensive. If they don't work, you're none the worse off. If they do work, you're ahead.