I do not like wasting my money or ingesting dubious supplements, therefore I always check Consumer Lab to assure me what's worth purchasing and what's worth trusting. Considering supplements are not regulated, I trust Consumer Lab to provide me with the information I need.
You would be foolish to take advertisements at face value, or your sister-in-law's postman's recommendation - I want a lab's investigation and get it via Consumer Lab. It's worth every penny!
Incidentally, I am 80 years old, look younger (other people say), and have absolutely no bone density loss; due to CL's collagen recommendation? I think so.
PS I have no association with CL other than as a long-time customer.