I’m not entirely convinced it will survive the digestive process and actually make its way to the cells that might regenerate collagen. Probably a case of it just passing straight through the body. However, no harm in trying. The degradation of articular cartilage (packed with collagen) was part of my Masters research and sadly it is one of those tissues that is built as we grow and really isn’t replenished well by the body as we age. (Hence arthritis and joint degradation/replacement). There are also genetic factors at play too. Collagen/Stem cell might elucidate more but that’s all quite thin on the ground at the mo.