 More generally , some scientific researchers have expressed objective concern over certain ingredients sometimes added to condoms , notably talc and nitrosamines . Dry dusting powders are applied to latex condoms before packaging to prevent the condom from sticking to itself when rolled up . Previously , talc was used by most manufacturers , but cornstarch is currently the most popular dusting powder . Talc is known to be toxic if it enters the abdominal cavity ( i.e. , via the vagina ) . Cornstarch is generally believed to be safe ; however , some researchers have raised concerns over its use as well . 
 More generally , some scientific researchers <a href='been_done' title='1'><mark>have</mark></a> expressed objective concern over certain ingredients sometimes added to condoms , notably talc and nitrosamines . Dry dusting powders are applied to latex condoms before packaging to prevent the condom from sticking to itself when rolled up . Previously , talc was used by most manufacturers , but cornstarch <a href='drop_aux' title='2'><mark>is</mark></a>currently the most popular dusting powder . Talc is known to be toxic if it <a href='uninflect' title='3'><mark>enters</mark></a> the abdominal cavity ( i.e. , via the vagina ) . Cornstarch is generally believed to be safe ; however , some researchers <a href='been_done' title='4'><mark>have</mark></a> raised concerns over its use as well . 
More generally , some scientific researchers done expressed objective concern over certain ingredients sometimes added to condoms , notably talc and nitrosamines . Dry dusting powders are applied to latex condoms before packaging to prevent the condom from stickin to itself when rolled up . Previously , talc was used by most manufacturers , but cornstarch currently the most popular dusting powder . Talc is known to be toxic if it enter the abdominal cavity ( i.e. , via da vagina ) . Cornstarch is generally believed to b safe ; however , some researchers done raised concerns over its use as well .