Though promising, it is important to discuss the shortfall of using biomarkers of (poly)phenol intake as a tool, which needs careful evaluation and validation
Reassessment of intrinsic factor and parietal cell autoantibodies in atrophic gastritis with respect to cobalamin deficiency
But oral glutathione at the same dose showed no statistically significant benefit
However, several things can inhibit the secretion of intrinsic factors, which in turn decreases the absorption of B12 by around half per dose, regardless of how high the overall dosage level is given
A: Generally yes, but spacing is recommended
A recent small study of healthy older adults given glyNAC, a supplement that increases glutathione levels, showed lower oxidative stress and inflammation after 24 weeks of treatment (10)