Joint supplements are definitely Jongkundang.

I trust that Chong Kun Dang is a company dedicated to conquering intractable, incurable, and rare diseases with new drugs and unmet medical needs that did not exist before, thereby improving the quality of life for the people.

When you first start taking joint medication, you may experience some headaches, but if you continue taking it a little longer,

At some point, the place that used to hurt when walking hurts less. I bought it as a gift for my mom, and she says she likes it.

The effects are clearly visible. That's probably why people trust and take Jongkundang.