Do the supplies provided for post-treatment care actually help?

Hi! I'm arriving in Korea next week and need to get some beauty treatments, but I'm not planning on finding a clinic here. I'm currently wondering what I should pack to ensure I can take good care of myself after I get back.

I've seen online many people recommend cooling face masks, soothing gels, and silicone sheets for reducing blemishes, but I'm not sure how effective they really are or which ones to buy. Has anyone packed something like this before? What did you choose, and did you find it helpful?

I'd love some advice from those who have been to Korea on what to focus on most, and how much self-care items did you pack? Thanks in advance!