I mentioned calcium and bone health here, because my doctor always advised me and even prescribed me calcium supplement after blood test in annual checkup. I did not put much effort in this area.

I did notice that animals(ie dogs) love eating bones and joints. Unless they are really stupid, there must have reasons for them doing that.

Below is another old paper regarding over the counter supplements.

Questions and Answers: NIH Glucosamine/Chondroitin Arthritis Intervention Trial Primary Study
https://nccih.nih.gov/research/results/gait/qa.htm

The reason I mentioned joints here, because they are Carb. I believe we must eat joints in low carb diets, but I have no scientific proof. Joint problems is not life threatening diseases, but they did spent $12.5 million in GAIT study. Hopefully we will know more of this.