 I don't think there's too much harm in trying them. These herbs are generally safe as long as you're using them properly. I mentioned arnica is always used as a topical medicine, never internally. Actually, there are instances where arnica can be used internally, but we don't recommend it because in that instance, you have to be careful because it does have an overactive effect on the liver. So really, as a general rule, just stay away from using arnica internally.