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Some researchers, like the ones behind a 2011 study, contend that digestive enzymes oxidize or destroy orally administered glutathione and prevent "significant intact absorption."2 Fortunately, there are some common solutions to the absorption problem, as explained in the following subsections
Before continuing the B12, I would recommend getting your B12 level tested with your doctor
Time your meals to allow overnight fasting
This extends shelf life slightly
It requires no excipients and minimal chemical processing, yet still provides a protective barrier and a vehicle to deliver nutrients and improve bioavailability
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