"A healthy blood-brain barrier is necessary for keeping unwanted molecules and cells from entering into the brain from the bloodstream. Without a healthy blood-brain barrier, pathogens can pass from the bloodstream into the brain, causing illness and even death. The blood-brain barrier also maintains central nervous system (CNS) homeostasis and ensures an optimal environment for neuronal function and growth."
DISCLAIMER: We are not medical professionals but can read what they say in the various articles linked on this site. Think for yourself. Make up your own mind.