Yes and no. Keep in mind that the main concern with consuming strains that produce D-lactate is their ability to cause D-lactate acidosis. GutPro™ contains L. plantarum which is not technically D-lactate free. However, Organic3 include it for a very good reason. It has actually been proven to reverse acidosis. L. plantarum initially produces L(+)-lactate, and then switches to producing D(-)-lactate, allowing for equilibrium to be reached. The production of D(-)-lactate in L. plantarum is linked to the biosynthesis of the cell wall. This case is similar for L. gasseri, which predominantly produces L(+)-lactate during the growth phase and switches to D(-)-lactate when the growth cycle plateaus. Additionally, L. salavarius primarily produces L-lactate and this is why it is commonly referred to as "D-lactate free". But, in reality it does produce a small amount of D-lactate. No studies have shown that this strain has ever caused acidosis. For more information on D-lactic acidosis, please see this Organic3 article on D-lactate free probiotics (http://organic3.com/d-lactate-free-probiotics/).