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I know that there are studies that show that sublingual B12 is as good as B12 injections (7) but my own experience suggests that this is NOT the case

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Importantly, commonly used in vitro BBB models, such as transwell systems and endothelial cell lines including RBE4, bEnd.3, and hCMEC/D3 monolayers, have important limitations, as they may overpredict permeability and do not fully recapitulate key in vivo BBB features, including physiological shear stress and multicellular neurovascular architecture (Katt and Shusta, 2020)

Vitamin B12 supports healthy hair by helping red blood cells carry oxygen to hair follicles

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