Does Green Coffee Bean Have Caffeine? (Spoiler: It Totally Does)

Does Green Coffee Bean Have Caffeine? (Spoiler: It Totally Does)

Let’s clear something up right away—green coffee beans absolutely contain caffeine. In fact, they often have more caffeine by weight than roasted beans. That might sound weird at first, but once you understand how roasting affects caffeine and bean density, it starts to make sense.

When I first started home roasting, I was curious about this too. I figured caffeine came from the roast. Nope. Turns out, that hit of alertness is baked into the bean from the very start—raw, green, and grassy as it may be.

So, What Is a Green Coffee Bean?

Before anything gets roasted, you start with a green coffee bean—the raw, unroasted seed of the coffee cherry. It’s:

• Hard
  

• Dense
  

• Pale green or bluish
  

• Smells grassy, not at all like coffee
  
  
  

This is what you load into your Kafgar Roaster before turning it into the aromatic beans we all love.

How Much Caffeine Does a Green Coffee Bean Have?

On average:

So if you had 100 grams of green robusta, that’s 2.2–2.7 grams of caffeine—almost double arabica. That’s why robusta is so popular in espresso blends and energy drinks.

Does Roasting Change the Caffeine Content?

Sort of. Here’s the catch:

• Caffeine is very stable under heat
  

• But roasting causes moisture loss, which reduces total bean weight
  

• So per gram of roasted beans, you might get slightly more concentrated caffeine
  
  
  

BUT… when measured by bean, green beans often have more caffeine than dark-roasted ones. Why? Because roasting causes bean expansion, and volume increases.

💡 TL;DR:

• Caffeine per bean goes down
  

• Caffeine per gram might go up
  

• Total caffeine stays pretty stable
  
  
  

Why People Use Green Coffee for Supplements

Green coffee extract became popular in health circles because of two things:

1. Caffeine – For energy and appetite suppression
   

2. Chlorogenic Acid – Believed to help with metabolism and fat burning (though research is still early)
   
   
   

That’s why you’ll see “green coffee bean extract” in supplements, not roasted coffee. The raw bean retains more polyphenols and acids lost during high-temp roasting.

Brewing Green Coffee (Yes, It’s a Thing)

You can technically brew green coffee, but it tastes… wild.

• Flavor: grassy, sour, woody
  

• Brew method: long steep (~10 mins), boiling water
  

• Use: mostly for functional beverages, not taste
  
  
  

Trust me—if you’re into delicious coffee, you’re better off roasting it first on a solid machine like a Kafgar. But if you’re into the health aspect, green coffee might have a place in your diet.

Caffeine in Green vs. Roasted Beans

Can You Decaffeinate Green Beans?

Yes—and that’s exactly when it happens.

Decaf coffee is made by removing caffeine from green coffee beans before roasting, using one of several methods:

1. Swiss Water Process
   

2. CO₂ Extraction
   

3. Ethyl Acetate / Methylene Chloride
   
   
   

These methods extract 90–99.9% of the caffeine while preserving as much flavor as possible.

Once the caffeine is removed, the beans are dried and roasted like any other.

Fun Fact: Roasting Dark Doesn’t Mean Less Caffeine

Lots of folks think dark roast = more caffeine because it tastes stronger. But actually:

• Dark roasts are less dense
  

• Lighter roasts may contain more caffeine per scoop (volume)
  

• But per gram, it’s not a huge difference
  
  
  

So if you want caffeine, focus on the bean origin (robusta vs arabica)—not just roast color.

Final Thoughts: Green Means Go (for Caffeine)

So yes—green coffee beans have caffeine. In fact, they’re loaded with it. That’s why they’re used in energy supplements, wellness drinks, and why they kick just as hard as roasted ones.

But let’s be real: the magic happens in the roast. With a Kafgar Roaster, you control every variable—bringing that caffeine to life with the flavor to match. Whether you’re roasting light and bright or bold and syrupy, the buzz is always there. You just decide how to dress it up.