I started my 12-yr-old black lab & 3 cats on C60 Evo in January 2022. What sold me was their clinical test results where the study group of rats lived 90% longer than the control group. I really wish I’d taken pictures of my dog’s face when I first started C60 Evo for Dogs & monthly pictures because the grey on her black face actually began disappearing! She has enough energy to do that puppy-ish wide-leg stance again that says, "Let’s play!" My 14-yr-old cat began running around & playing like a much younger cat as well.