glutathione and b12 together Folate (as THF), vitamin B6, vitamin are required for NAC and intracellular B12 processing:

Ans.Zeelab Glutathione Oral Solution can be taken with or without meals as recommended

Amic et al., Bypassing major venous occlusion and duodenal lesions in rats, and therapy with the stable gastric pentadecapeptide BPC 157, L-NAME and L-arginine, World J

For optimal results, we recommend an initial series of 3 infusions spaced one week apart, followed by maintenance sessions monthly or as advised by your practitioner

10.1096/fj.11-186460 FASEB J

doi:10.1371/journal.pone.0040365 Philippova M, Joshi MB, Pfaff D, Kyriakakis E, Maslova K, Erne P, Resink TJ (2012) T-cadherin attenuates insulin-dependent signalling, eNOS activation, and angiogenesis in vascular endothelial cells