I think Chong Kun Dang is the most trustworthy.

I'm not really interested in joints yet, so I don't know much about them.

But I searched on Naver by adding "joint" next to Chong Kun Dang, Korea Eundan, Optimust, Vitamin House, and GNM Nature's Quality.

But the most famous one seems to be Jongkundang joint supplement, right?

Joint pain relief, joint pain, and joint health supplements come in various types, so I think there are better options.

Perhaps the most trustworthy thing is being famous, so I think it might not be well-known.

So, I think Jongkundang is the most trustworthy, haha.