what do glutathione supplements do to Slow Aging? Here's the Liposomal Glutathione, with Vitamin C,

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PS is critical because it helps the brain use fuel more efficiently

More than 75% of people had low levels of methylmalonic acid (the best indicator of B12 deficiency), which would indicate that they were supplementing and out of danger (or that they had not been without supplementation long enough for levels to rise), but in 11 of the volunteers (5 OLV and 6 vegans) the levels were above the established cutoff point, of which 10 had plasma B12 levels in range, which would indicate a subclinical deficiency despite having apparently correct B12 in the analysis

Minden, A., Lin, A., Claret, F