Bulletproof coffee -- also called butter coffee or keto coffee -- is hot coffee blended with unsalted butter and MCT or coconut oil until it turns frothy, creamy and latte-like. Some people drink it in place of breakfast as part of a keto or intermittent-fasting routine. Below is a simple method, the ratios that matter, and how to blend it so the fat stays silky instead of slicking the surface.
What is bulletproof coffee?
Bulletproof coffee is a high-fat coffee drink: a cup of strong brewed coffee whipped together with a spoon or two of butter and a shot of MCT oil. The name comes from the brand that popularized it in the 2010s, but adding fat to coffee is much older -- Tibetan po cha blends tea with yak butter and salt, and versions of butter tea appear across the Himalayas. The modern "bullet coffee" trend pairs that richness with the low-carb, high-fat keto approach.
The key move is blending, not stirring. Whizzing the coffee and fat together emulsifies them, the way a vinaigrette comes together, so the drink turns pale, thick and foamy like a latte. Stir it by hand and the oil just floats on top. If you enjoy fat-forward coffee more broadly, our guide to coffee and cream covers the dairy side, and mushroom coffee is another trending twist on the morning cup.
What you need
You only need three core ingredients plus a way to blend them. Amounts are a starting point -- adjust the fat to your own taste and tolerance.
| Ingredient | Amount | Why it is there |
|---|---|---|
| Strong hot coffee | About 1 cup (240 ml / 8 oz) | The base; brew it on the strong side so the fat does not mute the flavor |
| Unsalted butter (ideally grass-fed) or ghee | 1-2 tbsp (about 14-28 g) | Adds body and a creamy mouthfeel; ghee is a clarified, lower-lactose swap |
| MCT oil or coconut oil | About 1 tbsp (about 14 g); start at 1 tsp | Fast-burning fats prized on keto; start small to avoid stomach upset |
| Optional flavor | Pinch of cinnamon, splash of vanilla, tiny pinch of salt | Rounds out the taste without adding carbs |
How to make bulletproof coffee: step by step
- Brew about 1 cup of strong coffee. Any method works -- drip, pour-over, French press, moka pot or a good instant. Aim for a slightly stronger brew than usual, since the fat softens the flavor. Water just off the boil, around 195-205F (90-96C), is ideal.
- Add the fats. Pour the hot coffee into a blender jug, then add 1-2 tbsp unsalted (ideally grass-fed) butter or ghee plus about 1 tbsp MCT or coconut oil. New to MCT oil? Begin with 1 tsp and work up over several days.
- Blend for 20-30 seconds. Use a countertop blender, an immersion (stick) blender or a milk frother. Blend until the surface is foamy and the color turns pale and latte-like. This is the step that emulsifies the fat -- do not just stir, or the oil will float.
- Pour and drink warm. Serve straight away in a mug while it is hot and the foam holds. Give it a quick swirl if it starts to separate.
Optional add-ins
A pinch of ground cinnamon or a few drops of vanilla extract adds warmth without carbs, and a tiny pinch of salt can round off bitterness. Collagen or protein powder is a popular texture add-in. Keep sweeteners low if you are following keto -- a keto-friendly sweetener rather than sugar keeps it in step with a bulletproof coffee recipe built around low carbs.
Tips and troubleshooting
- Oil floating on top? You stirred instead of blended, or blended too briefly. Give it a full 20-30 seconds.
- Stomach upset or urgency? This is common when you overdo MCT oil. Cut back to 1 tsp and build up slowly.
- Too greasy or heavy? Reduce the butter to 1 tbsp, or drop the oil to 1-2 tsp.
- Blending hot liquid? Fill the jug no more than halfway, hold the lid down with a towel and vent the steam so pressure does not pop the lid.
- Weak flavor? Brew stronger or reach for a darker roast; the fat mellows the coffee noticeably.
Is bulletproof coffee good for you?
This is where honesty matters. Bulletproof coffee is associated with keto and intermittent-fasting routines, and some people say it curbs their appetite and gives steady morning energy. It is not a proven weight-loss cure, and results vary a lot from person to person. What is certain is that it is calorie-dense: depending on how much butter and oil you use, a cup can run from roughly 230 to 450 calories, mostly from saturated fat. That means it replaces a meal's worth of calories rather than adding to a normal breakfast.
Because it is high in saturated fat and low in other nutrients, it is worth talking to a doctor or dietitian before making it a daily habit -- especially if you have high cholesterol, heart concerns, or are pregnant. If you are curious about coffee's upsides in general, see our overview of the benefits of coffee, and if you tend to reach for your first cup before eating, our guide to coffee on an empty stomach is worth a read.
Variations to try
Prefer a dairy-free cup? Swap the butter for extra coconut oil or a plant-based butter for a vegan butter coffee. Want it cold? Blend the coffee and fats first, then pour over ice -- the emulsion holds up better than you might expect, though it can firm as it chills, so drink it promptly. For a spiced version, blend in a pinch of cinnamon and a dash of vanilla, which lands close to a keto-friendly latte in spirit.
At its heart, bulletproof coffee is a two-minute recipe: strong coffee, good butter, a little MCT oil, and a proper blend. Treat it as a rich, occasional swap for breakfast rather than a health miracle, add the oil slowly, and tweak the ratios until the texture suits you. Once you have the technique down it is easy to riff on -- swapping fats, spicing it, or taking it iced -- and folding it into whatever morning coffee ritual you already love.