Consuming bitter roots and potentially poisonous berries was part of the Hadza's dietary practices.

“and then later on we eat some poisonous berries too many of them are probably a little bit of a tummy ache brewing and like oh go dig up this root and eat it so we go dig up these like really tiny skinny roots from this plant extremely bitter but i was able to chew on them and our guy gasper goes oh you here here's some water to wash all that dirt off like no gasps like this this is probably the medicine was probably getting the microbes from the dirt and less the actual root of the plant”