It is all talc. I heard stories about this decades ago. Most men involved in sport would use talc to avoid rubbing and chaffing and knowledgeable folks would have warned that it caused cancer in women and that men should use it sparingly and carefully and avoid breathing the dust.
However, the risk, if it exists, is thought to be very small.
Now, excuse me, but I must start a thread about the stories I have heard about diet Coke!!!!