That is really odd, "nutritional biochemistry." Sorry, haha, when I think of biochemistry I affiliate it with metabolism, enzymes, TCA cycle, etc. all of which require nutritional resources. Anyway, back on track, I would take regular biochemistry if you can do so without any trouble with your credits towards your major. It's always best to take the class that most closely resembles the area you are trying to prepare for. Like AlteredScale mentioned, it is better to take the exact class specified in order to dodge any obstacles that may arise in your application process. Better safe than sorry, plus, biochemistry is amazing and VERY useful.