At the risk of repeating, I posted this a while ago. It cites studies of the types of collagen needed to help bone growth, and the articles where I found the information.
https://connect.mayoclinic.org/discussion/collagen-for-osteoporosis/?pg=9#comment-804738
As nearly as I can tell, Fortibone contains Type I collagen plus some other ingredients, which studies show is not enough for bone strength. You need to study the collagens of interest to you to determine what they contain.
Further, I will reiterate - check out your local pharmacy and some of the on-line vitamin sellers who offer multiple brands. Supplements are not regulated, but reputable companies will show they are evaluated by an independent certifier like NSF or USP. On-line single type of supplement sellers tend to be among the most expensive ways to buy these items.
Sue