What does talcum powder cause cancer? Talcum powder is a cosmetic product used to absorb sweat, reduce friction, and keep odor away. However, in recent years, a growing number of studies have shown that talcum powder may also pose a cancer risk. Talcum powder carcinogen refers to the fact that the use of certain brands of talcum powder can increase the risk of ovarian cancer. This risk is because talcum powder contains a substance called talc, which has been shown to be inhaled through the female reproductive system and into the ovaries, thereby increasing the risk of ovarian cancer. where