Contents
Bulletproof Coffee Recipe: How to Make Butter Coffee
TL;DR: A bulletproof coffee recipe blends brewed coffee with grass-fed butter and MCT oil (or coconut oil) into a frothy, creamy drink. It takes under 5 minutes, delivers sustained energy without a blood sugar spike, and is a staple of keto and intermittent fasting protocols.
What Is Bulletproof Coffee?
Bulletproof coffee is black coffee blended with 1–2 tablespoons of unsalted grass-fed butter and 1 tablespoon of MCT oil. The blending emulsifies the fats into a latte-like foam. It was popularized by Dave Asprey around 2011, adapted from Tibetan yak butter tea.
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The name is a brand — Bulletproof® is a company that sells specific versions of this drink. But the core bulletproof coffee recipe is open, simple, and doesn’t require their products to work.
The fats slow caffeine absorption, reducing the sharp spike-and-crash pattern most people get from black coffee. For anyone doing keto or extended morning fasts, it also extends the fasting window without triggering insulin — fat doesn’t break a fast the way protein or carbs do.
Ingredients
You need three things: strong coffee, grass-fed butter, and an MCT or coconut oil. Quality matters more here than in a standard cup — fat amplifies any off-flavors in cheap coffee.
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| Ingredient | Amount | Notes |
|---|---|---|
| Brewed coffee | 8–12 oz | French press or espresso both work |
| Unsalted grass-fed butter | 1–2 tbsp | Kerrygold is the standard pick |
| MCT oil | 1 tbsp | C8 MCT for fastest ketone conversion |
| Optional: coconut oil | 1 tbsp | Substitute or split with MCT oil |
Butter matters. Grass-fed butter (Kerrygold, Anchor, or similar) has a higher CLA and omega-3 content than conventional. Regular butter works — you’ll just miss some of the nutritional rationale.
MCT oil vs. coconut oil. MCT oil is refined from coconut oil to isolate medium-chain triglycerides — it converts to ketones faster and has no flavor. Coconut oil works but is slower to metabolize and adds a faint coconut note. If you’re primarily after the keto/fasting benefit, MCT oil is the better call.
How to Make Bulletproof Coffee
Step 1: Brew Strong Coffee
Brew 8–12 oz of coffee at a higher ratio than usual — roughly 1:12 coffee to water instead of 1:15. The fat will mellow the intensity, so starting stronger balances it out.
French press is traditional because it preserves more of the coffee’s natural oils, which integrate with the added fats cleanly. Espresso works equally well and gives a richer base.
Step 2: Add Butter and MCT Oil to a Blender
Pour the hot coffee into a blender. Add butter and MCT oil directly — don’t stir.
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A standard countertop blender (Vitamix, Ninja, or similar) gives the best emulsification. An immersion blender works. Stirring does not — you get an oily slick, not a creamy drink.
Step 3: Blend for 20–30 Seconds
Blend on medium-high until the coffee turns pale, creamy, and frothy — it should look like a latte with a thick foam head. This takes about 20–30 seconds.
Blender safety: Hot liquid expands when blended. Fill no more than halfway, hold the lid down with a towel, and start on low before ramping up.
Step 4: Pour and Drink Immediately
Pour into a prewarmed mug and drink right away. The emulsion breaks as it cools — you’ll see fat separate to the top after 10–15 minutes. It doesn’t reheat well.
Photo: Elle Hughes via Pexels
Bulletproof Coffee Variations
The base recipe is intentionally plain. These variations add flavor without undermining the fat-blending structure.
| Variation | What to Add | Effect |
|---|---|---|
| Vanilla | ¼ tsp vanilla extract | Rounds out bitterness |
| Cinnamon | ½ tsp ground cinnamon | Mild sweetness, blood sugar support |
| Collagen | 1–2 scoops collagen peptides | Adds protein; won’t break ketosis |
| Cacao | 1 tsp unsweetened cacao powder | Mocha profile, added antioxidants |
| Sweetened | Few drops liquid stevia | Keto-compatible sweetness |
Collagen peptides dissolve completely in hot liquid and blend invisibly — it’s the most popular add-in after the core two.
Common Mistakes
- Stirring instead of blending — produces separated oil on top, not emulsion
- Too much MCT oil too soon — start at 1 tsp if you’re new; MCT oil causes GI distress at full dose until adapted
- Low-quality coffee — fat concentrates off-flavors; use beans you’d drink black
- Salted butter — the salt becomes oddly prominent once emulsified; always use unsalted
Does Bulletproof Coffee Actually Work?
The claims vary wildly depending on who you ask. What holds up: the fat does slow caffeine absorption, the drink is satiating, and it’s genuinely compatible with ketogenic and intermittent fasting protocols. What’s less clear: whether the specific MCT-to-butter ratio matters, or whether grass-fed butter provides meaningfully different metabolic outcomes than conventional.
If you’re not keto or fasting, butter coffee is just a high-calorie coffee drink — roughly 250–400 calories per cup. That’s fine, but framing it as a fat-burning hack without the dietary context doesn’t hold.
→ See also:
- Espresso Drinks: The Complete Guide to Every Type
- What Is a Cortado? (And How It Differs From a Macchiato)
- Cortado vs Flat White vs Macchiato: Full Comparison
FAQ
Can I use regular butter instead of grass-fed? Yes. The drink will still emulsify and taste the same. Grass-fed butter has higher CLA and omega-3 content, which is the nutritional argument for using it — but the practical difference in a single cup is small.
Does bulletproof coffee break a fast? It depends on your fasting goal. Fat calories don’t trigger an insulin response, so it’s compatible with ketosis-focused or autophagy-extended fasts. If your goal is strict caloric fasting (zero-calorie), a 300-calorie cup breaks the fast.
Can I use an AeroPress or Moka pot instead of a French press? Any brewing method works — the coffee just needs to be hot and strong. AeroPress produces a clean, concentrated cup that blends particularly well. Moka pot espresso also works.
Why does my bulletproof coffee taste oily? You didn’t blend it — or didn’t blend it long enough. Blending for a full 20–30 seconds is what creates the emulsion. If you’re blending and still getting oil, your blender may not be powerful enough for hot liquids; try an immersion blender directly in a tall cup.
Can I add milk or cream? You can, but dairy proteins can inhibit the clean fat emulsion. If you want a creamier drink, use heavy cream rather than milk — it has fewer proteins and blends more smoothly with the butter and MCT oil.
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