Analytical testing confirms greater than 99.8 % purity , assay content verified at 4.86 mg, molecular ion mass identified at 1815 Da and endotoxin levels measured at 0.009 EU/mg
Human research demonstrated that methylcobalamin supplementation in patients with inadequate B12 levels improved CD4/CD8 ratio and NK cell activity, and augmented CD3-CD16+ cells, suggesting an important role in cellular immunity.[14] In other research, among homologues studied, methylcobalamin was shown to have the strongest antibody production enhancement on an in vitro system.*[15]
van Veldhuisen SL, Gorter TM, van Woerden G, et al
L-carnitine doses around 3 g/day or higher may increase the chance of nausea, abdominal cramps, diarrhea or a fishy body odor
That's not a reason to fear glutathione it's a reason to care a lot about dose and supervision, which is the theme of this whole article
doi: 10.3389/fphar.2024.1378434 318 IseppiRTruzziESabiaCMessiP