Neither, in general, can reversed-phase HPLC purity: disulfide isomers can co-elute, and even when they separate, an area-percent figure at a single wavelength tells you the peaks are different, not which peak is the folded protein
This isn't about the medications, though
The strong the desire for a molecule to have its electrons in pairs determines how strong of an oxidant or antioxidant it is
As a consumer, your best defense is education
How much does Semaglutide GLP-1 cost
As of 2024, retatrutide has not received regulatory approval from the Medicines and Healthcare products Regulatory Agency (MHRA) or the European Medicines Agency (EMA) and remains an experimental compound