"GrassSaver" 4 Dogs? Is it safe? Or stupid????

I’ve got a client who started his Lab on this stuff recently:

www.petco.com/product/5845/NaturVet-Grass-Saver-Natural-Food-Supplement.aspx

Is this safe?

Methinks not–stuff must change the pH of the urine, and how could THAT be good? Not sure also if any of these ingred’s are fat-soluble…that just doesn’t sound good for a dog. Somewhere I remember being told that methionine isnt good for dogs(??)

DISCLAIMER: Please know that I didnt and wouldnt advocate this product. People will do what they want, and I’d like to have some opinions from my learned fellow COTHers to back up my opinion on using this stuff.