Korean-made vs. imported fillers: what’s the difference?

When choosing a filler, many people ask whether to go with a Korean-made or an imported product. More important than that distinction are the manufacturing standards, which differ from company to company.

Products differ in how the hyaluronic acid is produced, how the cross-linking agent is treated, how thoroughly it’s washed out at the end (and so how much of it remains) and what physical properties the filler has. These processes and figures vary from product to product. That said, any filler approved for use in people has had its safety confirmed.

At consultations, I compare it to choosing a car. Cars differ in performance and convenience, but in the end, which one you buy is up to you. Filler goes into your own body, so the choice should be yours.

One thing I do say clearly: filler is a tool, and the result it produces depends on the judgment of the doctor using it. That’s why I talk about where to place filler, and how much, before we talk about brand names.

Here is what the research shows. In a 2019 study that measured the physical properties of 18 fillers, the relationship between a filler’s firmness (G′) and how much it swells by absorbing water and how cohesive it is held only among products cross-linked the same way and at the same concentration. Hyaluronic acid concentration alone couldn’t predict a filler’s properties, and products differed widely.

The same goes for cross-linking agents. Existing reviews say that only very small amounts of the cross-linking agent (BDDE) remain in products and that it breaks down in the body. But a 2026 study that analyzed 38 products from 7 companies found that while BDDE was not detected in any product, the amount of a by-product formed during cross-linking (BDPE) differed by more than 1,000-fold between products. There were differences even among products approved by the US FDA. What makes the difference is not the country of origin but each company’s manufacturing and purification process. No study has compared Korean-made and imported fillers as groups.