The key to the efficacy of any glutathione supplement, is the bioavailability, dosage and clinical evidence behind the product
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As an active ingredient in supplements it is not recommended, because in addition to its low efficacy a low cyanide pollution also occurs
Some researchers claim that the absorption pathways of different vitamin B12 forms are similar, leading them to believe there is no difference in either the absorption process or capacity, nor in their effectiveness for treating vitamin B12 deficiency [108, 109]
The proteins that line the gut wall are similar in structure and function to those that line the brain and form the blood-brain barrier
Over extended periods of time, however, levodopa becomes less effective, and increased doses are needed