Why is there such a big price difference for collagen boosters from hospital to hospital?

I've become interested in skincare lately, so I've been looking into clinics and reading reviews. The price difference is much bigger than I expected, haha. I thought they were the same procedure, but I was a bit surprised to see that some places are affordable while others are several times more expensive.

I started to get even more confused, especially while looking into collagen boosters. There seem to be many different types of products, and since recommendations vary from clinic to clinic, it is difficult to establish a standard as someone researching for the first time.

I am curious if the price difference is simply due to a promotional event, or if it is because the products used or the sizes are different. I am also unsure if the effectiveness of collagen boosters varies depending on the type, and I would like to know if this is something I can only find out through a consultation.

I am not looking for the absolute cheapest option. I tend to think it is fine to pay a reasonable price as long as I am satisfied, so I am most curious about what aspects I should compare.

I've seen reviews saying that collagen booster recommendations vary depending on skin condition, so I'm wondering if it's a good idea to consult with several clinics. I'm worried that getting too many consultations might actually confuse me more, but I also feel a bit uneasy about relying on just one place to make a decision.

For those of you who have received this treatment, what did you consider most important when choosing a clinic? I'm curious whether the consultation with the doctor was more important than the price, or if you prioritized the types of products used. Please leave a comment if you have any experience!!