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Sugihara F, Inoue N, Kuwamori M, Taniguchi M. Quantification of hydroxyprolyl-glycine (Hyp-Gly) in human blood after ingestion of collagen hydrolysate. J Biosci Bioeng. 2012 Feb;113(2):202-3. doi: 10.1016/j.jbiosc.2011.09.024. Epub 2011 Oct 29. PMID: 22040651.


Kawaguchi T, Nanbu PN, Kurokawa M. Distribution of prolylhydroxyproline and its metabolites after oral administration in rats. Biol Pharm Bull. 2012;35(3):422-7. doi: 10.1248/bpb.35.422. PMID: 22382331.


Ohara H, Ichikawa S, Matsumoto H, Akiyama M, Fujimoto N, Kobayashi T, Tajima S. Collagen-derived dipeptide, proline-hydroxyproline, stimulates cell proliferation and hyaluronic acid synthesis in cultured human dermal fibroblasts. J Dermatol. 2010 Apr;37(4):330-8. doi: 10.1111/j.1346-8138.2010.00827.x. PMID: 20507402.


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