An in-depth look at the biological science and research studies behind Dr. Kellyann Petrucci’s diets and programs.

  • All About Collagen 
    Dr. Kellyann earned her nickname “The Queen of Collagen,” by proving the benefits of this incredible superfood through her patients’ amazing health transformations.*

  • Your Guide To Mini-Fasting
    Mini-fasting™, also known as intermittent fasting, helps support cell regeneration and gut health, and stops inflammation. It’s a powerful tool for weight loss and health transformations. *

  • Your Bone Broth Resource
    Bone Broth contains collagen, which helps your body burn fat. It helps beautify skin and hair, helps heal your gut, and detoxify your body. *

  • Books
    Browse and learn about Dr. Kellyann’s NYT Bestseller Dr. Kellyann’s Bone Broth Diet, plus the cookbooks and paleo guides that have helped hundreds of thousands of people lose weight and get healthy.*