Caffeine Content Doesn’t Lie! Does Starbucks Use Cheap Robusta Beans After All?

There are two major varieties of the coffee plant:  Arabica and robusta.  All the best tasting coffee, imbued with rich, subtle flavor, is made from arabica beans.  Harsher and more bitter coffees are brewed from robusta beans.  The only reason robusta varieties are used at all is that they are hardier plants and cheaper to grow and harvest.

Robusta coffee plants survive better than arabica coffee plants because robusta beans produce and contain about twice the amount of caffeine as arabica beans.  Because caffeine is a powerful insecticide and anti-microbial agent, the extra caffeine helps protect the robusta coffee plants from pests.

A recent Consumer Reports study demonstrated that a 12 ounce cup Starbucks coffee contains nearly twice the caffeine content of an equal size cup of Dunkin’ Donuts coffee.  So, it would appear that the coffee beans Starbucks uses have twice the caffeine as the coffee beans Dunkin’ Donuts uses.  Now, it is a fact that no arabica beans have nearly twice the caffeine content of any other arabica beans.  So, figure it out for yourself.  Starbucks claims to use arabica beans.  But the evidence of the caffeine content of its coffee puts the truth of that boast into considerable doubt!

Starbucks' Robusta Coffee vs. Dunkin' Donuts Arabica Coffee?

Of course, Dunkin’ Donuts uses a medium roast, which brings out the full flavor of its coffee.  Starbucks burns its beans, rendering them so uniformly bitter that it impossible to guess their humble origin by tasting.  Is it any wonder that Dunkin’ Donuts consistently tops the list of blind taste tests and Starbucks invariably falls to the bottom?

Starbucks Bitter Coffee Brew

In case anybody needs any more proof that Starbucks uses cheap junk robusta beans, you can be sure just because their coffee has twice the caffeine of McDonald’s.  The CSPI study showed that Starbucks coffee has 20mg of caffeine per ounce, compared with McDonald’s that has only 8mg per ounce!  See

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26 Responses to Caffeine Content Doesn’t Lie! Does Starbucks Use Cheap Robusta Beans After All?

  1. Ebrahim Hasan says:

    Robusta beans are round and small. Arabica beans are oval and large. The beans I see at Starbucks look like Arabic. When you buy their beans and brew them at home, it’s not as strongly caffeinated. So I’m guessing it’s something in their process that makes it more caffeinated.

  2. Lawrence M Backer says:

    I like coffee that doesn’t require gobs of cream, sugar, cinnamon and other things to kill the taste. As an old coffee ad used to say “Ask the man who drinks it black”.

    A good decently roasted arabica coffee should not be bitter. Starbucks and their imitators are bitter. The theory of over-roasted robusta beans sounds good. I don’t care. I don’t buy bitter coffee.

    McDonalds and Dunkin Donuts used to serve a mellow columbian arabica. McDonalds replaced it with a bitter brew. We no longer have Dunkin in our area. Stopped going to McDonalds because of the bitter coffee and rude counter help. I have my morning coffee at Whattaburger. Tastes good but not great. It is free to seniors. Can’t beat that!

    Give those of us who like it mellow coffee.

  3. Anca M says:

    What’s the problem with “cheap” Robusta coffee? :)

  4. My gut feeling on Robusta coffee is influenced by my 50 plus years of experience with animal nutrition,and intense observation of nature.Fact is that nature made robusta coffee bitter and pungent-Why?Like Rapeseed-which no animal would touch,and which is quite detrimental to health.Of course this was genetically modified to be Canola today(Canada oil),Good luck if you use it,
    I view the ever increasing addiction to be the primary cause of fibromyalgia in the world today.Some 12 million plus have been diagnosed with this in the US from what I read,and the onset and increase in this affliction coincides with the coffee consumption mania.There are coffee shops on virtually every corner and many in between,and they are not there for fun.They are businesses and the only thing that matters is the bottom line-same as every business in the world.
    Robusta is cheap,and that IS the bottom line.
    I have told some people who had early symptoms of fibro(tingling and numbness of hands and fingers) of my suspicions,and when they quit the coffee-you guessed it.
    Try it if you suffer-and tell all about it.

    • Robusta coffee is bitter because it contains a double dose of caffeine. It contains this double dose to help kill microbes and insects that attack the coffee plant. Period.

      • I know about the elevated caffeine content Alan,but not the reason nature made it so-as you say to kill bugs and insects! Of course if you are right-it leads to the gist of my concern.What does excess caffeine mean to human health?It may not kill us directly,but surely there must be some deleterious health effects.I point to fibromyalgia for starters.How many sufferers do you have in the USA now?

      • Aaron says:

        How do you know it “contains this double does to help kill microbes”? Without any proof, isn’t this just hyperbole? Also, can your prove without a doubt that Starbucks uses robusta? Follow the supply chain and show us. Don’t scream that it’s burnt junk. Show us. I have had their blond coffee which is not burnt. Does it also contain twice the caffeine? A previous employee sees the bags come in from a country and are labeled as Arabica. Is the coffee producer lying, too? I’m not attacking. I’m just asking for some proof behind the statement.

        • The proof is simple: Every time the caffeine content of Starbucks junk coffee is tested, it proves to have at least double the caffeine that Arabica coffee supplies. As it happens, Robusta coffee contains double the amount of caffeine that Arabica coffee contains. Q.E.D.

  5. John D'Suhn says:

    As someone who used to work in the roastery for Starbucks I can tell you with certainty that they use 100% Arabica beans. It’s all in where the bean comes from and the roasting method. Simple as that. I can take the same beans and roast them different ways and the can both be “medium roasts” but one will have more caffeine than the other. Also since Starbucks has its very own Coffee trading house I would expect that they are able to procure better quality beans than Sunkin ever will be able to. So yeah have a good one.

    • Working in Starbucks does not mean that you have been told the truth about their junk beans. And it wouldn’t really matter if they were Arabica (which they are not), because they are so burned that it is impossible to taste anything except burned bitter flavor. Obviously, you could medium roast any beans, but Starbucks doesn’t do this– it burns its beans all to hell! So, whatever kind of beans they might have been, they are completely ruined by being burned. End of story.

    • I’ve bought whole-bean Starbucks on a few occasions, between bags of my usual Stumptown, and I can tell you there’s a lot of robusta junk in there. You can tell because robusta beans are round, smaller, and have a straight slit in them. Arabica beans are larger, oval-shaped, and have a zig-zag slit.

  6. says:

    I think there is a variable here. That variable being that a synthetic caffeine maybe being added to the coffee Starbucks is using. As there are no requirements to list ingredients on a coffee bag aside from species and origin. Also they are suing the state of Vermont for the rights to not have to list ingredients. Vermont new GMO bill would make Starbucks list all ingredients in coffee. I think there’s a higher chance that the reason they’re so successful is that they’ve gotten people addicted to a synthetic substance. because it’s quite obvious to me that their coffee tastes really bad.

  7. Dan says:

    I roast coffee and work in the speciallty industry. I have no experience with robusta, but I do know that it has a significantly higher caffiene ratio.

    Contrary to popular belief, caffiene is a pretty stable compound that is not affected very much by the roasting process. Weight loss in say a ligh/medium roast may be around 14-17%, where a dark roast may be upwards of even 24%. So if you measure your beans on a scale, you may need up to 10% more beans of a dark roast to match the weight of a light. That would the dark roast would caffiene. But nowhere near enough to make the caffiene content double

    I haven’t had dunkin or Starbucks in years, but as far as I remember the Starbucks cup had a much greater brew strength.

  8. Coffee Connoisseur says:

    Ignoring the fact that Robusta coffees do not ALL contain more caffeine and their better ability to survive is based more on their ability to grow in lower elevations and the greater overall strength and hardiness of the plant. Have you even considered the fact that:
    A) Brewing method can and does have a great effect on the caffeine content of the resulting drink.
    B) Caffeine is burnt out of a Coffee the more it is roasted. Therefore if Starbucks coffee is so burnt that would mean it would have far LESS caffeine than Dunkin’ Donuts.
    If anything; the minimal evidence in this article suggests to me that Dunkin’ Donuts is using Robusta beans and burning them while Starbucks is using Arabica and does not burn them. Especially considering that I actually happen to know for a fact that Starbucks uses 100% Arabica.

    • “A little learning is a dangerous thing,” as your comment demonstrates. Robusta coffees contain an average of


      the caffeine of Arabica coffees. And you are right that long roasting does lower caffeine content, but it does not lower it enough to make Robusta coffee anywhere nearly as low in caffeine as Arabica coffee. Further, whatever you think about Starbucks coffee, it is evident from their wonderful taste that Dunkin’ Donuts uses Arabica beans! (If, in some magical way, Dunkin’ Donuts could have somehow made Robusta beans taste as good as Arabica beans, it should be congratulated! But, of course, this is impossible.) However, if you feel you “know for a fact” that Starbucks uses Arabica beans, then keep living in your dream world. I can’t shake the convictions of someone with your peculiar fantasies.

    • Peter Ronai says:

      I will no longer buy Starbucks coffee, because it is so bitter and burnt-tasting. To me it tastes like burnt plastic. I have two Starbucks gift cards which I refuse to use because I can’t stand the taste of their coffee. Frankly, I don’t understand why Starbucks is still in business.

  9. J. says:

    Yes Starbucks does use Robusta beans, or they at least mix them into their coffee beans maybe a ratio of 75/25 or 80/20 with the majority being Robusta. You can tell that they use Robusta beans since pretty much ALL of their coffees taste burnt, or their “light” roast coffee does not taste like a light roast coffee and tastes sour. Robusta beans burn while Arabica beans do not burn nearly as easily at low or standard temperatures for roasting coffee.