Worked and can see the difference.
Started my blue pit bull terrier on this supplement around 4 mos of age. Hes now 7 months and he looks amazing. His muscle tone, coat and energy level is a lot higher than most other pit pups ive seen around this age. Just finished my first 3mos supply and will order again. Highly recommend. Of course always make sure your pit is hydrated eats proper food. (blue buffalo is my recommendation). And if you want awesome muscle tone, youv'e got to give your dog regular exercise. No supplement will work magic, without proper diet exercise and proper hydration.