In one of these studies, measuring brain GSH levels with in vivo proton MRS yielded a correlation in GSH reduction and decline in cognitive functions with 87.5% sensitivity and 100% specificity (Mandal et al., 2015)
Rev Biomolecules
9 : 6771 Peng H, Poo M
2018, www.emdocs.net/acute-liver-failure-evidence-based-evaluation-and-management/
Customer feedback on this product (Judge.me, 5.0 out of 5 average across verified reviews) echoes the research timeline above: one reviewer specifically described the effect as "subtle" and something that "builds over weeks," which lines up with the 4 to 6-week window seen across ginkgo's clinical trials rather than an immediate effect
References Alesci S, De Martino MU, Mirani M, Benvenga S, Trimarchi F, Kino T, Chrousos GP (2003) L-Carnitine: a nutritional modulator of glucocorticoid receptor functions