在一些網站見到，牛同豬等用哺乳類動物提煉的骨膠原是好過 fish collagen，因為佢地的骨膠原一同二類都是和人一樣：
Collagen from cows, pigs and sheep is generally sourced from the skin where a combination of Type I and Type III collagen is found, these are the same types of collagen as in human skin.
Bovine collagen is extracted from the skin of a cow, and then sterilized and purified for use in supplements. It has been proven that bovine collagen is much more potent than other types of collagen supplements, such as fish or chicken collagen.
The lower proline and hydroxproline contents of cold-water fish and other poikilotherm animals leads to their collagen having a lower thermal stability than mammalian collagen.
This lower thermal stability means that gelatin derived from fish collagen is not suitable for many food and industrial applications.
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