According to recent studies, this peptide is so critical to human health that it could be possible to predict how long someone may live from the level of GSH in the cells (1, 2)
Hill reiterates

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doi: 10.1016/j.neuro.2012.04.001 129 KastenholzB.KastenholzB.HorstB.HorstJ
It means expectations around timing should account for these variables
The important thing to understand is that this date assumes proper storage throughout