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Mass Spectrometry Verification Mass spectrometry verifies peptide identity and molecular consistency

When System Xc function becomes impaired, cells cannot import cystine efficiently, leading to glutamate accumulation, GSH depletion, and decreased GPX4 activity

The ratio of GSH to GSSG decreases under stress conditions

When comparing oral vs injectable vs nasal routes, the data is unanimous: injections provide the most reliable systemic delivery of peptides

Interestingly, direct fibroblast proliferation as measured by cell assay was not significantly affected, suggesting the mechanism is more nuanced than simple cell replication