It seems as though you can't walk past an aisle at the store or notice a pop-up ad on your computer that doesn't preach about the many collagen benefits
doi:10.1038/newbio243085a0
We checked its public COA library and verified that recent lots had landed at purities ranging from 99.4% to 99.8%
Pochini L, Galluccio M, Scalise M, Console L, Indiveri C
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Deckel A, Duffy J (2000) Vasomotor hyporeactivity in the anterior cerebral artery during motor activation in Huntingtons disease patients