I have a very good health food store with a knowledgeable owner. If she suggests a certain root or herb, can I use it safely for claudication?

Which herb or root. Don't know. If you are recommended a certain herb or root make sure first it does not harm or interact with any of your medications before you try.
Claudication. Safety is uncertain and efficacy of herbal treatments are not proven with rigorous scientific double blind placebo controlled studies.