Our bones come from 100% grass-fed and grass-finished cattle. We use the bones that have the greatest concentration of white and red stem-cell marrow which contains the highest levels of collagen and nutrients. These bones are the knuckles, patella, femur, and feet.
On a side note, the farms we source our bones follow strict compliance guidelines that ensure that the animals are treated in the kindest, most humane ways possible. If you would like to read more about the cattle and how they are raised here are three great articles: