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Biological Activity: N-Propargylglycine is a brain-penetrant and orally active PRODH inhibitor. N-Propargylglycine covalently modifies enzyme-bound FAD and active site lysine, causing enzyme structural distortion, protein decay, and irreversible inhibition of proline and 4-hydroxyproline catabolism. N-Propargylglycine induces UPRmt, upregulates mitochondrial chaperones and YME1L1, enhances mitochondrial proteostasis, blocks astrocytic L-proline consumption, and abolishes L-proline’s ATP-maintaining and viability-protective effects. N-Propargylglycine stimulates neural processes, increases brain proline, hydroxyproline, and sarcosine levels, partially normalizes Huntington’s disease whole brain transcriptomes. N-Propargylglycine reduces hyperoxaluria, prevents calcium oxalate stone formation, reduces kidney tubular damage, and restores weight and survival in Grhpr knockout mice. N-Propargylglycine can be used for the research of breast cancer, neurodegenerative disorders, Huntington’s disease, and primary hyperoxaluria type 2^{[1][2][3][4][5]}.