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Butler L, Perone Y, Dehairs J, Lupien LE, de Laat V, Talebi A, Loda M, Kinlaw WB, Swinnen JV

In this form, glutathione can be transported more effectively across the cell membrane

If subclinical vitamin B12 is suspected, then circulating total vitamin B12 or transcobalamin (TC)-bound B12 (i.e., holo TC) in serum should be measured first, followed by methylmalonic acid (MMA) or homocysteine in serum, both more sensitive functional biomarkers that reflect B12 stores rather than intake

However, factors such as aging, stress, poor diet, and environmental toxins can deplete glutathione levels, potentially leading to a range of health issues

All references are to controlled laboratory studies this is not medical advice and these findings do not constitute evidence of therapeutic efficacy in humans