It's a gray area. Research peptides are sold legally as "not for human consumption," but buying and self-administering them isn't explicitly criminalized for individuals. The legal risk falls primarily on sellers making medical claims. You won't find cases of individuals being prosecuted for personal use. However, this is not the same as being fully legal—there's no consumer protection if something goes wrong, and the regulatory landscape is evolving. This is not legal advice; consult an attorney if you have specific concerns.