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Similar to the gut barrier, the brain has its own protective barrier that allows necessary substances to enter and exit while shielding the brain from harmful pathogens
If your levels are already adequate, extra B12 won't noticeably change how you feel it just keeps you topped off
Maiorino M, Scapin M, Ursini F, Biasolo M, Bosello V, Floh L (2003) Distinct promoters determine alternative transcription of gpx-4 into phospholipid-hydroperoxide glutathione peroxidase variants
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Activity of superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase in different stages of colorectal carcinoma
Some people report improved skin texture or a subtle glow as early as week two or three, but dramatic tightening typically has not yet manifested
