Excerpt from Practical Alchemy in Skyrim

Original media : ESO interactive map By Anonymous Now on to one of my favorite subjects—troll fat! Certainly one of the more expensive ingredients, assuming you can't wrestle down a troll or two on your own, but well worth it in versatility. It makes a perfect base for a variety of salves, of course, and can be used in the creation of long-burning candles (though some are put off by the musky smell). Combined with certain other ingredients, it can create a poisonous weapon coating, and in the right doses it can grant temporary resistance to poison, though the latter is a delicate process and should not be attempted by novices. One thing I cannot recommend is cooking with the fat, as it invariably adds an unpleasant flavor that recalls the smell of unwashed feet.