Is there any spell, feat, or class ability that allows natural attacks to bypass DR/Cold Iron?

I have seen the feat ‘Eldritch Claws’ which allows natural attacks to bypass DR magic and/or silver, but I have never found anything similar to bypass DR/cold iron. The DR rules are also pretty specific about having DR/cold iron oneself not being sufficient to overcome the same DR in others. I haven’t even seen any spells that would grant the ability to bypass cold iron DR.

Of course I know about the rules for overcoming DR/Cold Iron with a +3 weapon (which would require an Amulet of Mighty Fists +3 for natural attacks), but that is not always within reach–Maybe there’s something I’m missing?