what does reduced glutathione regenerating enzymes undergo developmental decline and sexual dimorphism in the rat cerebral cortex Glutathione/Glutaredoxin in Cellular Redox Homeostasis

So if you took B12 and felt worse, and your blood B12 is elevated, and you have a constellation of symptoms across multiple systems that's three signals pointing toward MCAS as worth ruling out

Proc Natl Acad Sci USA (2007) 104(38):150816

When a standard glutathione capsule enters this environment, the stomach acid may begin to break down the compound before it reaches the small intestine for absorption

However, you should: Call 999 or go to A&E immediately if you experience signs of a severe allergic reaction (difficulty breathing, severe throat/facial swelling, or collapse) Contact your GP if you experience a rash, itching, persistent pain at the injection site, or worsening neurological symptoms despite treatment If you suspect any side effects from your B12 injections, you can report them through the MHRA Yellow Card scheme (yellowcard.mhra.gov.uk)