Bulletproof Coffee Blend

The official recipe is brewed coffee blended with MCT oil and grass-fed butter, rather than milk or cream. It was created by Dave Asprey, who popularized the recipe and the Bulletproof brand around it.

The brand's signature product is Brain Octane oil, an MCT oil concentrated in C8 caprylic acid. Standard MCT oil blends C8 and C10 fatty acids, while Bulletproof's marketing positions pure C8 as faster to convert into ketones for energy.

Dave Asprey says the inspiration came from drinking yak butter tea in Tibet, which he then re-engineered into a coffee-based version back in the United States. He built the Bulletproof brand, including cafes and supplement lines, on top of that recipe.

It depends on your diet: fans on low-carb or keto plans value the fat-driven satiety and energy, while dietitians point out that a cup with two tablespoons each of butter and MCT oil is often cited as running well over 400 calories, mostly saturated fat. Using it to skip a balanced breakfast daily is where nutrition experts raise the most concern.