I have a container of epk kaolin it's been kept closed for a long time now. I played in it nude then put it away. Could anyone tell me if they think it's safe to use again? It does smell a little bad.

If there is nothing growing on the outside of the clay, it is probably ok as clay is anaerobic, no oxygen, so the only thing in it is usually anaerobic bacteria. Humans are aerobic so anaerobic organisms really don't like to hang out with us since we're full of oxygen. There is always some exception to the rule circumstance where there could be a problem, but not not likely here as the clay is going to end up on the skin.

Thank you for the information