Is it dangerous to get a GLP-1 medication from an unverified online source instead of a licensed provider?

Yes, this carries real risk. Unverified sources can't guarantee the product is genuine, correctly dosed, or safely stored/shipped, and counterfeit or improperly compounded versions have been a documented concern as demand for these medications has increased. Getting a prescription through a licensed provider and filling it at a licensed pharmacy is the way to ensure what you're injecting is actually what it's supposed to be, at the dose it's supposed to be. References: https://obesitycanada.ca/healthcare-professionals/adult-clinical-practice-guideline/