I have advanced osteoporosis (-5.1 T Score) at age 72, so I have made radical changes to diet and lifestyle. The first collagen I took was Applied Nutrition liquid collagen (Costco). I had to trust it was helping my bones, but the astounding thing was within days the arthritis in my fingers was no longer painful. There had been years of wearing compression gloves at night, using a mitt that I kept frozen to ease the pain, etc. There was no longer tightness in the morning and the pain was gone. So, hopefully, the bones are benefitting too. I alternate between the liquid collagen and one I order from Dr. McCormick, whom I consulted for osteoporosis. His product is Osteonaturals.