Why is mineral oil so bad for hair???

I wouldn't worry about mineral oil in conditioners because you are just going to rinse it back out anyway.  The problem is mineral oil in "moisturizers" or other products that will be left on the hair for a given period of time.  The molecules are too large to be absorbed by the hair shaft so it ends up just sitting on the outside and coating it--preventing precious moisture from getting in.  Over time, this can dry your hair out.  I prefer using natural oils like coconut oil, almond oil, carrot oil, olive oil . . . to seal in my moisture.  I always apply these oils after my waterbased moisturizer to get the maximum effect.  It is cheaper for manufacterers to put that oil in there as a "filler" the same way petrolatum is used--to add bulk and weight to your products.  Thats why most of the time when mineral oil or petrolatum is listed in an ingredient list it is usually first or second meaning it is taking up the bulk of your product and the rest of the ingredients are only in there in trace amounts.

Thanks, I am relieved to know that I don't have to get rid of my Dominican conditioner