glutathione sulfur sensitivity in Protein Redox Modulation through S-Glutathionylation and S-Nitrosylation Low Sulfur Diet PDF: A
Description
Temporary ALT/AST elevations occurred in a minority of participants and were generally tied to dose increases

Mitochondrial Research: NAD+ and Biogenesis NAD+ research has also extensively characterized its role in mitochondrial function

Journal of Applied Sciences and Environmental Management

In short, take any vitamin B12 overdose symptoms you come across with a grain of salt
