While the vast majority of people absorb enough B12 through their regular, balanced diet, there are some patients for whom this is much more difficult
Ursini, F et a l, Science Research done by Sorenson MB et al published in the journal Molecular Human Reproduction (a part of Oxford Academics) showed that when glutathione is present in extracellular space (outside the cell) it is able to react directly with cytotoxic aldehydes produced during lipid peroxidation (ROS) and thus protects the sperm plasma membrane
Confidence is Low for human efficacy
MEDIPEEL BioIntense Glutathione White Silky Toner (180) : , , , ,
(2018) documented that liposomal glutathione supplementation at 500-1000 mg daily elevated blood glutathione stores over 1-6 months in healthy adults (Sinha et al., 2018)
Yes, it is a natural antioxidant that reduces pigmentation