I had someone similarly "pitch" this product, and a naturopath advocating adjusting pH levels in your body, as it was "proven" that cancer cells could not survive in a properly pH balanced body.

I simply thanked the person for their interest, and advised that I preferred to take the advice of my team of medical professionals. I felt there was no point in arguing as those whose are ardent in their beliefs cannot be dissuaded, and arguing simply encourages further attempts to prove thier point.