Herbal medicine for boosting immunity

Lately, my immunity seems to have weakened, and I keep feeling tired.

I take vitamins and supplements, but I don't feel much of a noticeable effect... I've also been consistently drinking Hong Sangjin extract, but I don't think it helps much.

They say that if you take personalized herbal medicine after pulse diagnosis, it will improve your constitution and help boost your immunity.

I'm considering making herbal medicine after taking my pulse, but on the other hand, I hear that changing my constitution can cause difficulties.

I think herbal medicine might be effective, but are there any side effects or anything like that?