Secretome is the “signal mix” released by stem cells: growth factors, cytokines, and tiny vesicles/exosomes that can help calm inflammation and coordinate repair, like biological software. Because the blood–brain barrier makes the brain hard to reach, intranasal delivery is exciting since the nasal route sits close to neural pathways and may allow certain signals to reach the brain more directly (depending on formulation and device). Newer intranasal devices improve consistency and targeting com

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