This reduces shared air exposure in tight spaces
Beyond that, methyl groups donated through the methylation cycle land on DNA itself, which is how the body controls gene expression turning genes on and turning genes off
Of patients taking thyroid medication, 40% still had abnormal TSH valuessuggesting a need for better monitoring and disease control
Contamination, mis-dosing, and degradation are real practical risks separate from the molecule itself
J Neurochemistry 35:12421245 Kumar C, Igbaria A, D'Autreaux B, Planson AG, Junot C, Godat E, Bachhawat AK, Delaunay-Moisan A, Toledano MB (2011) Glutathione revisited: a vital function in iron metabolism and ancillary role in thiol-redox control