After reviewing the search results, it seems that there is no information available about any weight loss product used by Mimi Keene. However, there are some discussions about her weight loss and appearance in the latest season of the show "Sex Education". Some people have expressed concern about her weight loss and speculated that she may be on a very restrictive diet or have undergone a cosmetic procedure such as buccal fat removal. On the other hand, Mimi Keene has shared some of her beauty secrets in interviews, including her "shaky shaky" mascara method and her preference for a nude lip liner. There is no information available about any positive or negative effects of any weight loss product on Mimi Keenes health or appearance.