SAP (the vit C derivative, not the enterprise software, obvs) is a promising derivative that has great stability up to pH 7
Cho MM, DeVries AC, Williams JR, Carter CS (1999)
Besides, it stimulated expression of early growth response 1 (egr-1) gene responsible for cytokine and growth factor generation and early extracellular matrix (collagen) formation (but also its repressor nerve growth factor 1-A binding protein-2 (nab2)) (44)
In this study, we utilized the ultraviolet enzymatic method to measure serum GR activity in apparently healthy adults aged 20 to 79 years
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So before asking whether peptides work, you need to ask: which one, for what goal, and what does the evidence actually show