The difference between Nutrova Collagen+Antioxidants and Nutrova Poultry Collagen Peptides can be identified from their formulation and the specific goals they aim to achieve: One is a marine collagen supplement that includes antioxidants for the health of skin, the other is pure poultry collagen peptides, which are mainly used for joint and gut care. For those who want to focus on the skin, Nutrova Collagen+Antioxidants is the best option, but if you have an allergy to fish, or simply need a higher collagen intake, then the poultry option is for you as it helps gut and bone health too.