MCT oil could be one option because it’s a shorter chain saturated fat with a number of carbons divisible by 2,

I forget the reason this is better for ketogenesis than longer chain triglycerides, Google answers didn’t seem like what I had learned about it.

Avoiding high glycemic index carbs (sugar, dairy, starch) is a big factor. Also, water: beta oxidation of fat to make the ketones, is a hydrolysis reaction

https://en.m.wikipedia.org/wiki/Ketogenesis https://en.m.wikipedia.org/wiki/Beta_oxidation

> Ketone bodies are not obligately produced from fatty acids; rather a meaningful amount of them is synthesized only in a situation of carbohydrate and protein insufficiency, where only fatty acids are readily available as fuel for their production.

they used this product in the study - looks like subjects were geven about a 1/4-1/3 of the large bottle they sell, which is around $40 https://ketone.com