Higuero T, Abramowitz L, Castinel A, Fathallah N, Hemery P, Laclotte Duhoux C, Pigot F, Pillant-Le Moult H, Senjoux A, Siproudhis L, Staumont G, Suduca JM, Vinson-Bonnet B
Louis, MO, USA)
Indeed there are some studies showing these outcomes in humans (PMIDs: 30681787 & 34491424) Collagen contains a high proportion of glycine (33%), proline (~10%), & hydroxyproline (~10%) which may provide substrate for connective tissue synthesis However, one of the best protein metabolism labs in the world has conducted 2 studies demonstrating that collagen & collagen peptide supplementation does NOT increase connective tissue synthesis (PMID: 39086044 & 37202878)
Will Hair Grow Back
As you may know, aging tissue has a harder time repairing itself