Found this off the cytomax page. Worth a read.
There are many myths about lactic acid. Perhaps the greatest of all is the notion that there is lactic acid in the human body. There is not. The body actually produces lactate, which is lactic acid minus one proton.
The difference between lactic acid and lactate is, for all practical purposes, semantic. But other popular beliefs about lactic acid (or, as I will properly call it from this point forward, lactate) are about as wrong as wrong can be. Most triathletes believe that lactate is an end product of anaerobic muscle metabolism that causes local muscle fatigue by increasing the acidity of the tissues to the point where they no longer can function effectively. In fact, we now know that lactate is an intermediate link between anaerobic and aerobic muscle metabolism that serves as both a direct and indirect fuel for muscle contraction and delays fatigue in a couple of different ways....