What does Rhode Island prohibit in med spa advertising?

Short answer
The cited rules do not settle this — no list of approved claims exists; they bar advertising of medical business that tends to deceive, deceptive claims, soliciting patronage through agents, and unlicensed holding out as a practitioner of medicine.

Rhode Island’s advertising ground turns on TENDENCY, not proof of harm: all advertising of medical business that is intended or has a tendency to deceive the public is unprofessional conduct. Three neighbouring grounds reach the commercial conduct around a cosmetic practice directly — promotion by a physician of the sale of drugs, devices, appliances, or goods or services provided for a patient in a manner as to exploit the patient for the physician’s financial gain; soliciting professional patronage by agents or persons, or profiting from the acts of those representing themselves to be the physician’s agents; and gross and willful overcharging for professional services, including filing false statements to collect fees for services not rendered.