> The authors and the company, Newtree Co., Ltd., declare no conflict of interest to any extent.

I don't think they understand what "conflict of interest" means

Because Newtree produces the collagen used and one of the authors is employed by them

Who else would pay to fund it ..

Better link: https://pubmed.ncbi.nlm.nih.gov/29949889/

Glycine+lysine+vitamin C is known to strongly support collagen health. So should low MW collagen.