where do collagen peptides come from？

Just to chime in regarding market trends—whenever my customers ask me “where does this come from?”, they are usually trying to figure out if it fits their diet.
It’s important to remember that there is no such thing as real vegan collagen. Collagen is strictly animal-sourced. When we formulate for vegan customers, we actually have to use “collagen builders” (like Vitamin C, amino acids, and silica) rather than actual collagen peptides. Also, if you need to be Kosher or Halal certified, you generally want to stick strictly to bovine or marine sources and avoid porcine entirely.