Micelles formed using bile acids make hydrophobic molecules like fats and cholesterol soluble in water for transport.

“what we can do is we can make micelles and one of the things our bodies do is they use bile acids to make micelles and so as you're suggesting cholesterol is a steroid molecule it's a steroid backbone it's not soluble in water and so in order to make soluble in water if we want to reabsorb it we need to make micelles out of these bile acids”