When people buy collagen supplements, most don’t bother to inspect the label. The supplement says it contains collagen, and that’s good enough for them. What many people don’t realize, though, is that there’s no universal source of collagen.
The protein is found in every mammal as well as in numerous fish species. Collagen’s health benefits are pretty consistent across all sources, but they’re different in other ways that might influence your decision.
Consider these differences before picking out a collagen supplement.