Efun is the sacred clay chalk. It is used during ritual to mark a new follower of the orisha. The clay chalk is often kaolinite and is often white in color. The white symbolizes purity and new beginnings. It is used in ritual naming ceremonies and other ceremonies involving the orisha. Efun is often hard and needs to be softened with water in ordered to be used.

In Nigeria, pregnant women eat it to prevent feeling of vomiting. It is also taken to stop stomach problems, diarrhoea and cholera. It is ground into powder, mixed with water. And rubbed on the skin to stop skin rashes and itching.