This is part two of my Zymogen product review. Part one was for the Houttuynia Cordata Ferment Spot Cream. I read a Korean blogger's blog post about how the cream and this serum helped her with her acne, even though that post was sponsored, I still decided to give it try. Unlike the cream, the product description for this serum actually talks about acne and with tree tree oil in its ingredients list, this definitely seems like the right product to use for acne. As I mentioned in my cream review, I'm using this serum and the cream together. In addition, I've made changes to my diet such as more drinking more water and eating less sugar. I do think I'm getting less acne, but I don't know which product is helping the most. If you are only gonna buy one product from Zymogen for acne, I suggest this serum because the product description and the ingredients actually target acne. The cream, on the other hand, is probably more for sebum control than acne troubles.