The Short Version
Multiple peer-reviewed studies confirm that cells collected from human urine can be reprogrammed into induced pluripotent stem cells and then used to generate cerebral organoids exhibiting neurogenesis, astrogliogenesis, and neural network activity. The claim is substantively accurate. However, "functional" in this context refers to basic neural activity and developmental markers — not mature, vascularized brain tissue — and the process involves intermediate reprogramming steps, not direct growth from urine cells.