joint supplement-sound ok to you?

I have a human joint supplement i bought for my mom because she always complains about her joints hurting. However, she refuses to take it-go figure. Im researching and comparing against other supplements, but additional help would be valued. If anyone knows if any of these ingredients are harmful to dogs it would be great. microcrystalline cellulose (Ive seen that in a dog supplement) crospovidone, povidone, croscarmellose sodium, titanium dioxide, dextrose, stearic acid, sillicon dioxide, hypromellose, magnesium stearate, polyethylene glycol, sodium carboxymethylcellulose, sodium citrate, light mineral oil, polysorbate 80, dextrin shrimp crab and crayfish. one pill contains(I would give 1 every other day as just a little extra help for his growing bones-I dont believe in supplementing every day.) 20 mg vit c, 1 mg maganese, 500mg glucosamine, 400 mg chondroitin, 1 mg boron