The most common example is the body joining glutathione to these molecules
Antioxidant Protection at the Scalp Level: The molecule is recognized for its role in neutralizing free radicals, protecting follicles from oxidative stress that can accelerate premature hair aging

Contact your GP if you experience: Unexpected symptoms after starting B12 supplementation, including persistent skin reactions, gastrointestinal disturbance, or mild allergic manifestations Neurological symptoms such as significant tingling, numbness, weakness, or balance problemsthese may indicate B12 deficiency paradoxically, or alternative neurological conditions requiring assessment Unexplained fatigue or malaise that develops or worsens despite supplementation Concerns about medication interactions , particularly if taking metformin, proton pump inhibitors, or other medications affecting B12 metabolism [2] [4] Seek emergency medical attention (call 999) if you develop signs of a severe allergic reaction following B12 injection, including facial swelling, difficulty breathing, or widespread urticaria
"S-acetyl-glutathione oral bioavailability." Int J Clin Nutr Diet
4.3.3 Clinical outcomes and trials Liver transplantation is seeing improvement in early allograft function partly thanks to these targeted interventions
Altogether, these data indicate that GSH is differentially important in FoB and MZB at steady state, and that MZB show higher dependency on GSH upon in vitro activation