Collagen can be extracted from various biological sources, typically from what might be considered food waste that doesn't make it into a dogs every day diet.
Commercially, collagen is usually produced from bovine, seafood, porcine or eggshell sources.
Typically collagen is extracted through a process of pre-treatment (cleaning & size reduction) followed by the extraction process using either precipitation, centrifugation, dialysis and then an enzymatic process resulting in collagen peptides ready to be freeze dried to a powder form.
Collagen peptide supplements are used across a range of applications including wound care, pharmaceuticals, biomedical services and the cosmetic market.
Typically seafood sources produce type I collagen.
Bovine/Porcine primarily yields type II & type III.
Eggshell membrane produces type V & type X collagen.