Totally agree with you as replacements are not all they are "quacked" up to be.

I have never encouaged my boys to excell at sports as joint damage is common in many athletes.

Health is far more important.

I do beleive aa agrivates already existing joint issues. How to determine how to support the joints is of interest to me. Bones have the materials fir bone, and adding vitamins and collagens would seem to be beneficial, too.

Its common to feed joint supplements to sport horses. Chindroitin and msm. Building and maintaining the cartilage is critical to performance.

Makes me wonder why humans get less consideration.

I used to add selenium and vitamin E to foal and mare feed.

More questions than answers......