Chong Kun Dang recommends Premium MSM.

My mom's friend's friend said they took it and saw positive effects, so I gave it to my mom, and she says it's much smoother when walking. Of course, CJ CheilJedang is a well-known pharmaceutical company in Korea, so I trust it. It contains MSM and vitamin D, which help maintain joint, bone, and cartilage health all at once. Therefore, I trust and recommend CJ CheilJedang Premium MSM.