Is dietary supplement effective for weight loss in Korea?

Recently, I received a diet supplement called 'Inner Beauty' from a Korean friend, and I'm curious if it really works. It is said that this product alone can help with weight loss, fat reduction, and appetite suppression. I've seen many of these supplements at places like Olive Young in Korea, so is there a reason why these products are popular there? I heard that the diet supplement market in Korea is quite big. You can easily find them in busy areas like Gangnam or Hongdae, and it seems like many people use them. Would it be effective for someone like me, a foreigner? I would like to hear the opinions of those who have tried these products before.