Beta-Hydroxybutyrate – Beta-hydroxybutyrate, else known as BHB is an exogenous ketone (1) that is common in these kinds of products.
https://ketopillsstore.com/product/carrie-underwood-keto/
https://groups.google.com/g/carrie-underwood-keto-pills/c/BdoK-_CKRn4
https://www.completefoods.co/diy/recipes/carrie-underwood-keto-2
https://bumppy.com/tm/read-blog/10200