<p>Does consuming L-theanine with caffeine, either in drink (like <em>matcha</em>) or in pill form, affect the half-life of caffeine?</p>
<p>I have heard something like <em>&quot;L-theanine slows caffeine absorption&quot;</em>, so I am inclined to assume that caffeine's half-life may increase, but I have no idea if one can jump to that conclusion. And I cannot find anything on this topic.</p>

CC BY-SA 4.0
2020-12-24T20:03:52.260Z
Isn't this more of a chemistry (how do these compounds interact?) or biology (how do these compounds interact in the human body?) question?
JJJ
CC BY-SA 4.0
2020-12-25T14:38:19.577Z
Yes it is. I did not fund such forums but also found the Medical Sciences StackExchange, and asked there.
João Bravo
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2020-12-25T18:34:18.853Z
I’m voting to close this question because it's not really about coffee and the [cross-site dupe op med.SE](https://medicalsciences.stackexchange.com/q/25314) already received an answer.
JJJ
<health><caffeine><chemistry>
Does L-theanine affect caffeine's half-life?
João Bravo
# Does L-theanine affect caffeine's half-life?

(Asked by: username_0 on 2020-12-17)

Does consuming L-theanine with caffeine, either in drink (like *matcha*) or in pill form, affect the half-life of caffeine?

I have heard something like *"L-theanine slows caffeine absorption"*, so I am inclined to assume that caffeine's half-life may increase, but I have no idea if one can jump to that conclusion. And I cannot find anything on this topic.

**Tags:** health, caffeine, chemistry

> **Comments:**
> **username_1**: Isn't this more of a chemistry (how do these compounds interact?) or biology (how do these compounds interact in the human body?) question?  
> **username_0**: Yes it is. I did not fund such forums but also found the Medical Sciences StackExchange, and asked there.  
> **username_1**: I’m voting to close this question because it's not really about coffee and the [cross-site dupe op med.SE](https://medicalsciences.stackexchange.com/q/25314) already received an answer.  

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