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Tea Leaves and Caffeine - for the Cautious or the Cravers.

Whether you are caffeine cautious or a caffeine craver, this article will walk you through some interesting points and maybe answer a few questions along the way.

One of the questions we at The Duffy Tea Co get asked a lot is do your teas contain caffeine?

The answer is yes, some do but some don't.

Here is a guide to all things tea - caffeinated or not.

The following teas are all from the Camellia Sinensis plant and all contain caffeine in various amounts :Black Tea has around 37mg of caffeine per 100ml.Oolong & Green around 31mg.White & Yellow around 27mg.Puerh has around 21mg, with the highest by far being Matcha, with around 126mg per 100ml.

Not Quite that simple

So that's a basic guideline but there is a little more to it than that. The amount of caffeine you will actually consume can vary, depending on how you brew your leaves. Hot water dissolves caffeine and the longer you steep the more caffeine is extracted into your brew. Tea is typically brewed at lower temperatures to get the best out of the leaves. For example, green tea should be brewed at between 74°C to 80°C and not for very long. So, a cup of green tea, while it will give you a caffeine boost, has perhaps not as much as you first thought.

Now let’s take a look at Matcha, which is super good for you but has the highest amount of caffeine. As with regular green tea, when brewing Matcha you use only a small amount brewed at around 70°C. Steeped for only a short time, not much time is allowed for caffeine extraction. It would typically take around 7 to 8 minutes to brew all of the available caffeine into your brew, by which time all the mentioned caffeinated teas would be ruined - unless you love a really, really strong cup of tea!

Is Caffeine in Tea Different to Caffeine in Coffee?

Here is another little bit of info that is also quite interesting in terms of the caffeine in your tea being different to the caffeine in your coffee.

Caffeine is caffeine is it not?

Yes indeed, but tea contains tannins (something we will explore in our next blog) which slow down the absorption of caffeine into the blood stream, making it a more gradual process compared to the instant caffeine kick with coffee.

What if I reuse my leaves ?

All our blends at The Duffy Tea Company can be brewed up to three times. So, if you're caffeine conscious, does that mean you get more caffeine the second and third time you rebrew? No, this is not the case. In fact, tests show that the first cup will give approximately 62% of the available caffeine, 26% in the second and just 8% in the third. Those rules differ slightly in terms of green tea as it can be said that, due to the short brewing time of green tea, the second cup may actually contain more caffeine than the first. That's getting pretty technical but worth a thought all the same.

I don't want any caffeine, what can I do?

All fully herbal teas are caffeine free, as are fruit infusions. The list of available blends and flavours is endless, so there is no shortage of options. Our brewers guide will let you know which of our blends are caffeine free or not, so we have you covered!

If you love your tea with milk, or without for that matter, a great choice is Rooibos. Sometimes overlooked, Rooibos should never be underestimated as its quite a superstar in the tea world and is defiantly worth a try. We will be exploring Rooibos further in a future blog.

We hope this has made for an interesting little read and look forward to bringing you future blog posts. If you have a tea topic you would like us to cover, get in touch at and we will defiantly see what we can do.

The Duffy Tea & Beverage Company.

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