Bulletproof Coffee is the company name for a blended coffee recipe made with brewed coffee, MCT oil and ghee. It is one version of a broader butter-and-MCT coffee idea. The recipe is easy to describe; the claims often attached to it are less settled. It is a calorie-containing coffee drink, not a proven cognitive or weight-loss intervention.
The manufacturer’s recipe is one version, not a universal formula
Bulletproof’s current one-cup recipe calls for brewed coffee, 1 tablespoon of C8 MCT oil and 1 tablespoon of grass-fed ghee, blended for 20–30 seconds. The company lists that serving at 250 calories and 27 g of fat. It also says that people new to MCT oil may begin with 1 teaspoon and increase toward the full serving over several days. Those are the manufacturer’s recipe and preparation directions, not independent evidence of a health outcome. See the current recipe and nutrition listing.
Recipes made with different amounts or types of coffee, butter, ghee, or MCT oil will not have the same nutritional profile. Blending disperses the added fat through the coffee; it does not remove the drink’s calories.
What the MCT evidence can—and cannot—show
MCT means medium-chain triglyceride, a type of dietary fat. In a 2020 systematic review and meta-analysis, MCTs increased beta-hydroxybutyrate, a ketone body, in studies involving people with mild cognitive impairment or Alzheimer’s disease. The review included 12 records and 422 participants; its authors concluded that MCTs may improve cognition in those populations, while noting that risk of bias in the available studies meant further trials were needed. Read the review.
That evidence does not establish improved focus or cognition for healthy adults, and it does not test Bulletproof Coffee as a beverage. More broadly, a Cleveland Clinic review notes that many proposed MCT benefits lack concrete evidence; it describes limited findings on appetite and small weight-loss effects rather than a reliable result for everyone. Read its evidence overview.
Calories and fasting
The labeled manufacturer recipe contains 250 calories, so it ends a caloric fast. Whether a person uses it within another eating pattern is a separate, goal- and protocol-specific question; this article does not make claims about insulin, autophagy, or “metabolic fasting.”
The same distinction matters for weight-related claims. Adding MCT oil and ghee changes a cup of coffee into a calorie-containing drink. Evidence cited for MCTs does not make that drink a demonstrated weight-loss method.
Saturated fat, caffeine and tolerance
Butter is a source of saturated fat. The American Heart Association states that eating too much saturated fat can raise LDL cholesterol and recommends an overall dietary pattern with less than 6% of total calories from saturated fat. That is population-level dietary guidance, not a safety clearance or a diagnosis for any individual. See the American Heart Association’s guidance.
Coffee also brings caffeine to the drink, and caffeine content varies by product and serving. For most adults, the FDA has cited 400 mg per day as an amount not generally associated with negative effects, while emphasizing that sensitivity and elimination vary and that medication use, certain conditions, pregnancy, attempts to become pregnant and breastfeeding warrant discussion with a health care provider. Caffeine from coffee is only one part of the day’s total intake. Read the FDA guidance.
MCT oil can be poorly tolerated at larger doses. Cleveland Clinic notes possible abdominal pain, nausea, vomiting and diarrhea, and advises clinician discussion for relevant heart or liver conditions. The manufacturer’s suggestion to start with a smaller amount is a practical recipe note, not a substitute for individualized medical guidance. See the clinician-reviewed MCT overview.
A useful way to assess the drink
The clearest trade-off is in the recipe itself: the cited version turns coffee into a 250-calorie drink with 27 g of fat. That may suit a particular meal pattern or preference, but it does not settle whether it suits a person’s broader diet, caffeine tolerance, medical history, medication use, pregnancy, or health goals. For those questions, a qualified clinician can provide individualized guidance.
Sources and limits
This article distinguishes the manufacturer’s current recipe from public-health guidance and published research. It does not report product testing, clinical testing, or personal results. Recipe details and product labels can change; consult the linked manufacturer page for the current formulation.