Using our exclusive ranking system, we ranked hundreds of products to determine the #1 best diet pill of 2018 and FENFAST 375 took the top spot. How did we come to the decision to make FENFAST 375 the best diet pill of 2018? We carefully reviewed every aspect of this diet pill to determine the safety of each ingredient, formula effectiveness, and results of user reviews found across the web. FENFAST 375 consistently ranked above the competition in all 3 categories.