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Another phenolic derivative from the phenylalanine/tyrosine pathway, 4-hydroxybenzoic acid (4HBAC), was also significantly elevated at 8 weeks

64 3351 (Elsevier, 2012)

Research suggests it may upregulate collagen expression and growth factor signaling in cell and animal models, though translation to clinical efficacy in humans remains preliminary and requires additional rigorous studies

In particular, they noted decreased levels of GSH with age in all tissues tested, which was associated with a reduced expression of GS and GCL in the absence of any changes in the expression of GGT and GSH reductase, cysteine availability, or the amount of GSSG as an indicator of oxidative stress [83]