Think of the BBB as a vigilant security system, with the specialised cells lining the blood vessels in the brain regulating the movement of substances, and protecting neural tissue from toxins and pathogens. When the interconnected cells lining the BBB lose their permeability, the blood-brain barrier becomes weaker and less effective at destroying harmful microorganisms — and alterations in the finely-tuned defence system are linked to an increased progression of neurological conditions like dementia, Alzheimer’s, MS, depression and anxiety.
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