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Description
GSH accounts for about 95% of the total non-protein thiols within cells, with intracellular concentrations ranging from 0.5 to 10 mM, far surpassing the levels of free cysteine (3-4)

We found very low-quality evidence that oral vitamin B oral treatment costs less 12 appears as safe as IM vitamin B 12

At this time, there are no known side effects or precautions

The actual research shows the opposite