Hunter-gatherer groups like the Hadza consume calcium by breaking bones and sucking marrow, and by eating small fish with bones.

“my impression has been that hodza used baobab as sort of like Americans use milk”

“i just got back from africa and people ask me do the hodzy eat bones they definitely break the bones and suck the marrow and when you do that you're getting bone flakes with that if any culture is going to be eating small fish like sardines or other things like this you're going to be getting some calcium in those bones”

“do the habs get it every day no you don't necessarily have to get every day do the habs get it every day probably not but they definitely get some calcium from small animals galagos bush babies birds they're going to eat the ends of the bones they're breaking the bones they're getting bone shards in there okay so hunter-gatherers do eat calcium from bones”