glutathione converts hemoglobin to methemoglobin Postscript • The Blood Project Causes and mechanisms of methaemoglobinaemia
Description
Timing and food intake: Taking B12 supplements with or immediately after meals often reduces stomach upset significantly
This depends very much on what condition you are treating and its severity

doi: 10.1002/path.1711700203

Nelson DB, Tayob N, Mitchell KG, Correa AM, Hofstetter WL, Sepesi B, Walsh GL, Vaporciyan AA, Swisher SG, Antonoff MB, Roth JA, Rice DC , Vauthey JN, Mehran RJ
Ran for 8 weeks saw increases in strength and gained muscle mass

I especially recommend it 2 weeks before and after any radiation exposure (CT scans)
