Orthobiologics and Peptide Therapy for Central Nervous System Repair in Neurodegenerative Conditions.

Alzheimer's disease and Parkinson's disease remain the most prevalent neurodegenerative disorders associated with aging and continue to lack curative treatments. Their pathophysiology is often multifaceted, encompassing protein aggregation, mitochondrial dysfunction, chronic neuroinflammation, synaptic degeneration, and vascular compromise. This complex landscape reduces the effectiveness of single-target pharmacological agents and underscores the need for therapies capable of acting across multiple axes. Orthobiologics and peptide-based strategies exemplify this approach. Autologous cellular alternatives such as platelet-rich plasma, bone marrow aspirates, mesenchymal stromal cell derivatives, and extracellular vesicles deliver paracrine signals that can reprogram glia, preserve mitochondrial function, and promote synaptic and vascular repair. Peptide therapeutics, including glucagon-like peptide-1 receptor agonists and novel sequences targeting protein aggregation or mitochondrial pathways, provide complementary precision by engaging defined receptors and intracellular cascades. Together, these modalities converge on mechanisms central to circuit preservation rather than symptomatic relief alone. Preclinical studies across Alzheimer's and Parkinson's disease demonstrate consistent neuroprotective and functional benefits, and early human trials support feasibility and safety. The translational path forward requires standardized preparation, biomarker integration, optimized delivery routes such as intranasal administration, and regulatory frameworks adapted to biologic therapies. This review synthesizes current evidence on orthobiologics and peptides in neurodegeneration, outlines safety and translational considerations, and highlights future directions, including rational combinations and biomarker-driven trials. By uniting the broad signaling capacity of orthobiologics with the precision of peptides, neurology can move beyond symptomatic care toward regenerative strategies that aim to preserve neural circuits and improve long-term outcomes in Alzheimer's disease and Parkinson's disease.