Originally Posted by OvaTersley
I read somewhere that wort is missing one important nutrient for yeast and that is iron, I don't think raisins are all that high in iron. doesn't Wyeast make a powdered yeast nutrient, that contains all the important stuff not found in wort?
You really don't need to be adding nutrients, however many companies will love to sell you them.
The only real concern is zinc deficiency, but that's not a concern for the first few generations at least.