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It requires a specific protein produced in the stomach to bind to the B12 molecule, and then specialised receptors in the lower small intestine to actually take it up into the body

As further illustrated in two recent articles, urinary excretion rates applied to a given biomarker level will affect the calculated exposure (PDI)

A small pilot study designed to evaluate the safety of lipoic acid in 30 people with relapsing or progressive multiple sclerosis found that treatment with 1,200 to 2,400 mg/day of oral lipoic acid for two weeks was generally well tolerated (see Safety) (95)

And thats because glutathione is also known to have health benefits