Is FMT legal in the US?

Excuse me, I'm curious about the legality of FMT, or fecal microbiota transplantation, in the United States. Could you please clarify if this procedure is considered legal within the country's jurisdiction? I understand that it's a fairly new and unconventional medical treatment, so I'm eager to learn about its current legal status. Additionally, if it's not legal everywhere in the US, could you provide some insight into the states or regions where it's permitted or restricted? Thank you for your time and attention.