I've read a few suggestions that ester-c may help prevent some bone and joint problems in large-breed dogs. I also see that ester-c contains a good amount of calcium - about 100mg per 500 mg of vitamin c. Would this extra calcium be bad for a large-breed puppy? I'm not entirely sold on the preventative effects of ester-c and if the extra calcium is not good, I would probably wait until my puppy is grown to start supplementing. TIA