The evidence is preclinical only
These cells are glued together by proteins called Tight Junctions. When you eat a poor diet, take antibiotics, or live under chronic stress, this glue breaks down
Other researchers have pointed out that even pharmaceutical-grade methylene blue contains impurities, and that industrial-grade or chemical-grade methylene blue, like that sold as a stain or dye, should not be used in humans or animals
Oh IS, Shimizu H, Satoh T, Okada S, Adachi S, Inoue K, et al
For example, how bad the deficiency is, or if the body cant absorb it well
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