When choosing collagen it is important to check that it is both ethically and sustainably sourced, not only for environmental obligations but also because of the impact that the treatment and environment of the source has on it's nutritional profile and benefits.
Marine collagen. It is made from GMO factory-farmed tilapia - often the eyes, scales, and other leftover parts of the fish. This is proven by the fact that it typically has protein listed in it. Pure collagen is NOT a dietary protein. If you see protein listed in a collagen supplement, it comes from the random ground-up animal parts. Essentially, it is “the hot dog of collagens” Marine collagen is also notoriously high in mercury, lead, arsenic, and BMAA which is linked with neurodegenerative diseases.
“Vegan” collagen. There is no such thing. Collagen is produced by animals (including humans! Though our production of collagen slows drastically after age 25, and it becomes necessary to supplement). There is no way to produce collagen from plants. So you’re wasting 100% of your money with this option. The best sources for collagen are cows and chickens, preferably chickens as theirs most closely mirror what our bodies produce naturally.
High-quality type II liquid collagen (best absorbed, and Modere’s is clinically proven to act as type I, II, and III in the body). Our great grandparents made collagen (bone broth) from chicken bones. Type II collagen does so much more than hair, skin, and nails (which it is incredible for). It’s also incredibly beneficial to gut health + joints. And I love that I’m covering the bases of type I, II, and III, and avoiding heavy metals and GMOs.