Are you aware that "lactic acid" is not what actually slows you down after you've been going hard for a sufficient time?
Lactate, in and of itself, is actually used by muscles as a source of fuel and is merely glucose that's been broken down.
Still, there's nothing in a bottle/pill that's going to "reduce" the biological process of lactate formation other than a reduction in exercise intensity. You can do the work necessary that will allow your body's muscles to better utilize the lactate and buffer the resultant hydrogen and phosphate ion production from glycolysis, but there are no shortcuts out there...that simple.