The FTC's Endorsement Guides and Standards for advertising substantiation apply directly to medspa marketing. Regulators scrutinize aesthetic claims with particular intensity: "reduces wrinkles," "eliminates cellulite," "permanent results," and similar assertions trigger enforcement action if unsupported. Before/after photos, testimonials from staff or influencers, and clinical claims all carry specific compliance obligations. For practice owners, the stakes are material—FTC actions result in corrective advertising orders, civil penalties, and reputational damage. Understanding what you can claim, how to document it, and where the FTC draws lines protects your practice and your marketing spend.