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They are composed of various proteins, including claudins, occludin, and junctional adhesion molecules, which work together to seal the spaces between epithelial cells

It is important to distinguish between targeted therapeutic uses in compromised immune systems and general immune boosting in healthy individuals

Gudbjartsson, D

J Immunol 164:62876295 Nishiyama A, Matsui M, Iwata S et al (1999) Identification of Thioredoxin-binding Protein-2/Vitamin D3 Up-regulated protein 1 as a negative regulator of thioredoxin function and expression

If you need to take a B-complex supplement, always choose reputable brands that volunteer to have their products independently tested by organizations like the US Pharmacopeia (USP)