Reconstituted peptide stability is the main practical concern for laboratory handling: refrigerated storage at 2-8C and protection from light are standard, with a typical functional window of four to six weeks post-reconstitution
Bioidentical forms of B12, including methylcobalamin, adenosylcobalamin, hydroxocobalamin, are preferred over cyanocobalamin because of better bioavailability and safety
The problem: the gastrointestinal tract breaks down most of the glutathione from food before it reaches the bloodstream
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Combining medication with other strategies improves long-term success
Attia's 5,000 IU dose is perhaps a bit high: The National Institutes of Health says the safe upper limit for vitamin D is 4,000 IU a day