Hi, I'm glad you are happy with the flavors and understand your concern

This is certainly a valid concern and one we have addressed several times but seems to get buried so maybe at some point I will combine some sticky threads and create a FAQ that addresses these type issues.
Our Gooey Better Cake is indeed made to simulate the taste of an St. Louis Gooey Butter cake but it's a play on words of Betty Crocker. In truth the only real butter in a Gooey Butter Cake is the crust, it is more of a sweet cream cheese cake with powdered sugar. An explanation can be found here
Gooey butter cake - Wikipedia, the free encyclopedia
Without tipping our cap too much we use flavorings from 4 different vendors in that recipe, 3 which claim to be free of the "D"s. The only one that isn't is TPA and we have a very good working relationship with Linda and are using some of the newer flavorings that are described as Diacetyl free in this.
Now like you depend on us to relay information to you, we are in much the same position from our flavoring vendors, we take their word or posted information for their claims. I personally vape this everyday and I can see where some perceive it as butter flavor but knowing the recipe I guess changes my perception and I don't really taste butter. The more important fact is there are no custards nor do I taste any custard notes.
Now having said all that can I say with 100% fact that it completely free from them? No, I can't, I can only assure you that we take the information provided to us and use that which every vendor that has not undergone testing can do. I can also tell you that we do plan to start having our liquids tested once we recover our initial investment and are able to do so. We have our customers health and safety at the forefront of our decisions and always will as we vape what we sell and stopped smoking to improve the quality and longevity of our lives.