Earlier quoted context omitted.
This very little evidence that diet affects acne. I'm glad you found a solution, but food probably had little to do with it. Especially "greasy" food, which is one of the items they list on their website. They also say that antibiotic solutions are a "myth", which is patently false.
There are several kinds of acne. The kind that you get when you hit puberty is not related to diet. Adult acne in most cases is however. The thing is food does not directly cause acne. The logic is pretty simple actually. Acne causing bacteria grow in blocked pores and greasy food and dairy makes me super oily . More sebum more blocked pores aaand more acne.
Source? Because no, it's not.
There's also no evidence that greasy food increases sebum production.
You're buying into a bunch of snake oil.