Herbal medicine (weight-gaining herbal medicine)

I am an older guy who wants to gain weight and bulk up with muscle.

Gaining weight is really difficult; no matter how much I eat, my weight stays the same.

Have you heard that there are many cases where traditional Korean medicine is used to help gain weight? Has anyone experienced its effectiveness?

I am realizing that stress from gaining weight is just as significant as stress from not gaining weight.

Even if I eat diligently and eat a lot, it's just breaking even.. But staying still without moving my body at all is also difficult..

Eventually, I am considering seeking help from traditional Korean medicine. I would like to hear about the experiences of those who gained weight through herbal medicine.