RecruitingPhase 2Biological interventionAutologous Adipose-Derived Mesenchymal Stem Cells for Chronic Traumatic Brain InjuryThe global objective of this study is to establish the safety and investigate the potential treatment effect of an intravenous infusion of HB-adMSCs (Hope Biosciences adipose-derived mesenchymal stem cells) on brain structure, neurocognitive/functional outcomes, and neuroinflammation after traumatic brain injury.