The origin of collagen dictates the biggest differences in quality of a dietary supplement end product.
Considering this fact, I immediately knew which ones I would eliminate from my list. The best choice is definitely marine collagen.
Not because I was a vegetarian, but because fish collagen boasts up to 150% proven greater absorption (an excellent scientific article is to be found here). Generally speaking, the reason for better absorption is that fish collagen consists of smaller molecules. Another advantage is its composition. There are several types of collagen available.
For example, type 1 collagen is the most represented protein in the body (up to 80%) and it is also the one responsible for maintaining a youthful skin appearance, and stronger hair and nails. Marine collagen is mainly composed out of type 1 collagen and this is why it the most efficient.

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