It's Kimchi, the secret ingredient is Kimchi.
South Korea with another win there!

Scientists Say This Popular Food Could Help Your Body Get Rid of Microplastics
Researchers found that a bacterium from kimchi can bind and help expel nanoplastics from the body, showing promise as a probiotic approach to reducing plastic accumulation. Scientists in South Korea have identified a surprising ally in the fight against plastic pollution inside the human body: a