Methionine and cysteine play roles in glutathione synthesis and recycling
Ensuring an adequate intake of selenium may mitigate the risk of developing cancer, autoimmune disorders, infertility issues, or succumbing to severe illnesses, although it is acknowledged that certain conditions arise from specific genotypes of selenoproteins
A Systematic Review on Insulin Overdose Cases: Clinical Course, Complications and Treatment Options
A final practical note: because the constituent vitamins have FDA-approved labeling where applicable, a prescriber can anchor part of the decision to established references while still tailoring the whole to you
This can include B12, but it can also exclude it depending on the specific supplement, so it's essential to look at the Supplement Facts label of any given B-Complex to know which B Vitamins are included