Blend 240 ml (8 oz) of hot, strong coffee with 1 tablespoon of grass-fed unsalted butter and 1 tablespoon of MCT oil for 20 to 30 seconds, until it turns light tan with a thick foam on top. Stirring won’t work; the fat needs a blender to emulsify. With that 1 + 1 ratio, a mug comes to roughly 230 calories.
Bulletproof coffee is a good recipe wrapped in a lot of marketing. Strip the marketing away and what’s left is simple: hot coffee, a spoonful of butter and a spoonful of MCT oil, blended until it looks like a latte. It’s creamy, filling and fits a keto or fasting morning. It won’t turn you into a different person before 9am.
This bulletproof coffee recipe is the classic build in single-mug form. It takes about 6 minutes, most of which is brewing, and the only gear you can’t skip is a blender of some kind. An immersion blender works right in a tall mug, a personal blender works in its jar, and a full-size one works if that’s what lives on your counter. Add MCT oil, a block of grass-fed butter and a heatproof mug big enough for the foam:
What is bulletproof coffee, and where did it come from?
It’s black coffee emulsified with butter and MCT oil, usually drunk instead of breakfast. Dave Asprey popularized it around 2011 and built the Bulletproof brand around it, crediting yak butter tea he’d tried in Tibet as the inspiration. The routine spread fast through tech and keto circles as a morning ritual with big promises attached.
The idea of putting fat in a hot morning drink is much older. Tibetan butter tea, made with tea, butter and salt, has been a staple at high altitude for centuries. Bulletproof coffee swaps tea for coffee and salt for MCT oil.
What the drink reliably does is keep you full for a few hours, the way any fat-rich breakfast does, and make coffee taste rich and creamy. If you eat keto or skip breakfast on purpose, that’s useful. The claims about sharper thinking beyond what caffeine gives you haven’t been backed up by convincing research, so treat it as breakfast, not a brain supplement.
Why does bulletproof coffee have to be blended?
Because fat and coffee don’t mix on their own. Stir butter into black coffee and you get a yellow slick floating on top, and the first sip is pure grease.
A blender breaks the butter and oil into tiny droplets and disperses them through the coffee. The milk solids in butter help hold that emulsion together, which is why the butter version foams up so much better than oil alone. It’s the same principle a chef uses when mounting cold butter into a pan sauce to make it glossy: lots of agitation, fat broken small, and the result looks creamy instead of oily.
Twenty to thirty seconds on high is enough. You’re looking for a light tan, opaque drink with a thick foam cap. If you still see oil on the surface, give it another 10 seconds.
Two things make the emulsion easier. Strong coffee, because weak coffee tastes thin once the fat goes in, and hot coffee, so the butter melts instantly. Warm the mug with hot water first and the foam lasts longer.
MCT oil, coconut oil or more butter?
MCT oil is the classic choice. Brain Octane, the Bulletproof brand, is concentrated C8 (caprylic acid), which the body turns into ketones faster than longer-chain fats. Plain virgin coconut oil works one for one. It contains a mix of MCTs and longer-chain fats, so the ketone effect is smaller and the coffee tastes more of coconut, but for most people drinking this for the texture and the fullness, that hardly matters.
Go slowly with MCT oil if you’ve never had it. Start with 1 teaspoon (5 ml) and work up to the full tablespoon over a few days, because a big dose on an unprepared stomach can send you running.
Does the butter have to be grass-fed?
No. The original recipe calls for it because pasture-raised dairy has a slightly different fat profile, with a bit more omega-3. The difference in your mug is small. Ordinary unsalted butter tastes and blends the same, so use it if grass-fed is hard to find or pricey where you live.
What about the coffee?
Use any fresh, decently roasted coffee you already like. Part of the Bulletproof brand story was that ordinary coffee is full of mold toxins and you need specially tested beans. Commercial coffee is regulated for those contaminants, and fresh beans from a roaster you trust are perfectly good here. What matters more is strength: brew it a little stronger than usual.
How many calories are in bulletproof coffee?
With the amounts in this recipe, about 230 calories per mug. A tablespoon of butter (14 g) is around 100 calories and a tablespoon of MCT oil is around 120 to 130, while the coffee adds next to nothing. You can check the butter and oil figures yourself in USDA FoodData Central.
Many cafe and online versions use 2 tablespoons of each fat, which pushes a mug to around 450 calories, close to a full meal. Either way, almost all of those calories come from fat, much of it saturated.
So the arithmetic is simple. Drunk instead of breakfast on a keto or fasting plan, it fits. Drunk alongside your usual toast and eggs, it’s a second breakfast.
Bulletproof coffee recipe
Prep time: 1 minute. Brew time: 4 minutes. Blend time: 30 seconds. Total time: 6 minutes. Serves: 1.
Ingredients
- 240 ml (8 oz) hot brewed coffee, freshly made
- 14 g (1 Tbsp) grass-fed unsalted butter
- 15 ml (1 Tbsp) Brain Octane MCT oil, or substitute virgin coconut oil
Instructions
- Brew the coffee first, using 16 to 18 g of medium-fine ground coffee per 240 ml (8 oz) of just-off-boil water in any method you like: pour-over, French press, drip machine or AeroPress. It should be hot and strong.
- Pour the hot coffee into the blender jar, or a tall mug if you’re using an immersion blender. Add the butter and the MCT oil. If you’re new to MCT oil, start with 5 ml (1 tsp) and work up over a few days.
- Blend on high for 20 to 30 seconds, until the coffee turns creamy and light tan with a thick foam cap. If a slick of yellow oil is still floating on top, blend for another 10 seconds.
- Pour into a warmed mug and drink while hot. The foam holds for a few minutes, and the drink is best in the first ten.
Notes
Treat one mug as a meal rather than a drink on the side.
If you have high cholesterol, heart disease in the family, or gallbladder, digestive, kidney or liver problems, ask your doctor before making this a daily habit. The fat load is significant, and concentrated MCT oil can upset digestion.
Five ways to change the cup
Mocha
Add 1 to 2 teaspoons of unsweetened cocoa powder to the blender with the fats. The chocolate covers the butter flavor for anyone who finds the plain version too rich, and a pinch of cinnamon sits well with it. Keep the cocoa unsweetened for keto; a teaspoon of monk fruit or stevia adds sweetness without sugar.
Cinnamon
Blend in 1/4 to 1/2 teaspoon of ground Ceylon cinnamon, which is softer and sweeter-tasting than the more common cassia. It rounds off the butter and makes the drink taste closer to a chai latte. This is the version I’d hand to someone trying bulletproof coffee for the first time.
Decaf for the afternoon
Use a good decaf, ideally Swiss Water Process, which keeps the flavor closest to regular coffee. The texture and fullness stay the same, without the caffeine keeping you up. Avoid instant decaf here; it tastes flat once the fat goes in.
Dairy-free
Skip the butter and use 2 tablespoons of virgin coconut oil. The drink is lighter, less foamy and more coconut-flavored, and it still needs the blender. For more body, add 1 to 2 tablespoons of full-fat coconut cream or unsweetened cashew cream.
Weekday butter-oil paste
Soften 7 tablespoons of grass-fed butter and whisk it with 7 tablespoons of MCT oil into a smooth paste. Spoon it into a glass jar and refrigerate. Each morning, add 2 tablespoons of the paste to the hot coffee and blend. It keeps for two weeks in the fridge, saves a minute every morning and keeps every mug portioned the same.
Who it suits, and who should skip it
Bulletproof coffee fits a particular kind of morning. People who fast in the morning drink it to stay full until lunch. Keto eaters use it as a fat-heavy breakfast that keeps carbs near zero. Some endurance athletes drink it before long, easy training sessions. In each case the mug replaces a meal.
It’s a poor fit if you’re pregnant or breastfeeding, when a more balanced breakfast does more for you, and it isn’t a drink for children. Anyone with the health conditions mentioned in the recipe notes should check with a doctor first. And if you don’t eat keto or fast on purpose, a mug of butter and oil on top of a normal breakfast is just extra fat you didn’t need.
Bulletproof coffee questions
Is bulletproof coffee good for you?
It depends on what the rest of your day looks like. As a breakfast replacement on a keto or intermittent fasting plan, it does its job: filling, high in fat and close to zero carbs. Added on top of a normal breakfast, it is mostly extra saturated fat and calories, and the brain-boosting claims have not held up.
Why do you put butter in coffee?
Butter makes the coffee creamy and filling. Blended in, it emulsifies into a latte-like drink, and the fat keeps you full far longer than black coffee does. The idea echoes Tibetan butter tea, a long-standing high-altitude breakfast drink.
Does bulletproof coffee help you lose weight?
Not on its own. It can help if it replaces a bigger breakfast or makes a morning fast easier to stick to. Drunk in addition to your usual breakfast, its 230 to 450 calories per mug can easily tip you into eating more than you need.
Can I use coconut oil instead of MCT oil?
Yes, virgin coconut oil swaps in one for one. The coffee tastes more of coconut and the ketone effect is smaller than with C8 MCT oil, but the texture is just as creamy, and coconut oil is often gentler for beginners.
Why does my bulletproof coffee separate?
It separates because it was stirred instead of blended. Butter and oil need the high speed of a blender or immersion blender to break into tiny droplets that stay suspended in the coffee. Blend for 20 to 30 seconds on high and the oil slick disappears.
Key takeaways
- The classic mug is 240 ml (8 oz) hot coffee, 1 tablespoon butter and 1 tablespoon MCT oil.
- Blend for 20 to 30 seconds; stirring leaves an oil slick.
- At this ratio a mug is about 230 calories, so treat it as breakfast, not an extra.
- Start with 1 teaspoon of MCT oil if you’ve never had it.
- The fullness and texture are the benefits; the brain-boost claims lack good evidence.
Build a keto breakfast around the mug
If the coffee is replacing breakfast most days, plan what you’ll eat when you do want food. A couple of avocado deviled eggs made the night before cover a late-morning hunger without breaking the low-carb pattern.
Sorting out which pantry staples fit keto takes some label-reading. This breakdown of whether chickpeas are keto shows how to work out net carbs for a common one, with better swaps.
On hot days, when a steaming mug of butter is the last thing you want, try one of these iced coffee pairings instead.
Last update on 2026-10-15 / Affiliate links / Images from Amazon Product Advertising API
