Numerous studies also examined BBB-related changes and responses to SARS-CoV-2 infection or spike (S) protein treatment in postmortem tissue and animal models 14,15,21,23,24,25,26,27,28
This is especially important for individuals with absorption issues, such as those with gut inflammation or certain dietary restrictions
A 2020 study found that the death rate among people with the highest levels of B12 in their bodies was almost twice as high as that of people with the lowest levels of B12
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