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So if you took B12 and felt worse, and your blood B12 is elevated, and you have a constellation of symptoms across multiple systems that's three signals pointing toward MCAS as worth ruling out

Neuroprotection by astrocytes in brain ischemia: importance of micrornas

Fatigue, mental fog, irritability, and low mood are often brushed off as just stress. But sometimes, the real culprit is something deeper like a vitamin B12 deficiency

doi: 10.1002/bip.360030207
