If you have symptoms that fit deficiency, asking your doctor about methylmalonic acid is reasonable even when the B12 looks fine
"The body has mechanisms to control most of them, including ergothioneine and glutathione, but eventually enough accrue to cause damage, which has been associated with many of the diseases of aging, like cancer, coronary heart disease and Alzheimer's." According to the researchers, who report their findings in a recent issue of Food Chemistry, the amounts of ergothioneine and glutathione in mushrooms vary by species with the porcini species, a wild variety, containing the highest amount of the two compounds among the 13 species tested
It is not a drug, food, cosmetic, or dietary supplement, has not been evaluated by the FDA
Once reconstituted with bacteriostatic water, vials should be stored between 2C and 8C