Do you have a link to the page on their site that states this? I don't see any mention of this on the pages I've viewed.
Guys, how do you think does Guinness stout has caffeine? As I know it hasn't, but my friend says that it has...
It does not.
The website says it has "naturally occurring caffeine" so I am assuming it does have some. Even decaf coffee has some caffeine in it.
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I did a search. I found that information it said "Contains natural coffee and coffee flavors. Caffeine occurrence it natural"
Guinness stout (the regular stout) does not contain coffee, natural or otherwise.
Around 60 or so plants are known to produce caffeine, but barley and hops are not among them. It's nonetheless conceivable that trace amounts of caffeine might be found in barley and hops tissues. Any such caffeine would originate in other plants that might be growing, either intentionally or accidentally, alongside/within the barley and hops fields. When these plants die or drop leaves, the caffeine in their tissues would leach into the soil and could be uptaken by the barley or hops, resulting in "naturally occurring caffeine." I have no idea about the specific farming practices involved in growing barley or hops, so this is just conjecture. The point is, whatever is in the soil will also be found in the plants growing in the soil.
As a side note, caffeine is made by some plants that you might not expect: citrus plants, for instance, produce small amounts of caffeine in their flowers. It has been shown to improve the memories of the bee pollinators. None of it ends up in the fruit, though. And the common garden bush Camellia sinensis
has long been known to produce it.