<p><strong>Short answer</strong><br />
<a href="https://www.ponderapharma.com/wp-content/uploads/2014/06/The-effects-of-l-theanine-caffeine-and-their-combination-on-cognition-and-mood.pdf" rel="nofollow noreferrer">Haskall <em>et al</em>., The effects of L-theanine, caffeine and their
combination on cognition and mood, <em>Biol Psych</em> (2008); <strong>77</strong>: 113–22</a>.</p>
<p><strong>Background</strong><br />
Here's some of the detective work I've done:</p>
<p>The principal investigator of this study is listed on your link on <a href="https://clinicaltrials.gov/ct2/show/NCT00487227" rel="nofollow noreferrer">ClinicalTrials.gov</a> as <a href="http://www.andrewscholey.com/" rel="nofollow noreferrer">Andrew Scholey of Northumbria University</a>.</p>
<p>Looking on Google Scholar, and searching with the key terms &quot;Andrew + Scholey + Caffeine&quot; and looking for publications <em>after</em> the study's '<em>actual completion date</em>', as listed on <a href="https://clinicaltrials.gov/ct2/show/NCT00487227" rel="nofollow noreferrer">ClinicalTrials.gov</a>, I found an article by Scholey &amp; coworkers, namely:
<a href="https://www.ponderapharma.com/wp-content/uploads/2014/06/The-effects-of-l-theanine-caffeine-and-their-combination-on-cognition-and-mood.pdf" rel="nofollow noreferrer">Haskall <em>et al</em>., <em>Biol Psych</em> (2008); <strong>77</strong>: 113–22</a>.</p>
<p>The study doesn't mention 'ClinicalTrials.gov Identifier: NCT00487227' explicitly, but given the study's senior author (Scholey), the publication date (2008) being a few years after the clinical study's completion date (2005), and the topic of the paper (cognitive effects of caffeine) that closely resembles the clinical trial's topic, I bet this is the article you're after.</p>
<p>Otherwise, I should simply contact Scholey - most researchers appreciate an email enquiry about their work. More often than not they're eager to spread their work across the scientific community.</p>

CC BY-SA 4.0
2021-03-29T09:00:19.393Z
Thanks for your effort. I doubt the the study you provided is the actual study, because the caffeine levels are very different. (2.5mg, 5mg, 10mg vs. 0mg, 150mg, 150mg & 250mg theanine, 250mg theanine) I will follow your advice and contact the author..
CuriousIndeed
CC BY-SA 4.0
2021-03-29T09:35:57.647Z
@Rubus aha, I hadn't looked that specifically :) Good luck! Please add your own answer here when you find the paper.
AliceD
CC BY-SA 4.0
2021-03-29T07:04:13.910Z
2021-03-29T08:52:39.520Z
2021-03-29T08:52:39.520Z
AliceD
<p>See <a href="https://www.sciencedirect.com/science/article/pii/S0195666308000196" rel="nofollow noreferrer">Caffeine at levels found in decaffeinated beverages is behaviourally active</a>  <em>Appetite</em> Volume 50, Issues 2–3, March–May 2008, Page 559.</p>
<p>It's just a conference abstract though.</p>

CC BY-SA 4.0
2021-03-29T16:27:32.323Z
Nice!! Thanks a lot!!!
CuriousIndeed
CC BY-SA 4.0
2021-03-29T15:57:12.310Z
2021-03-29T15:57:12.310Z
DavePhD
<p>Can somebody help me find the following study:
<em>Effects of Low Doses of Caffeine on Mood, Physiology and Mental Function</em>, listed under trial identifier <em>NCT00487227</em> on <a href="https://clinicaltrials.gov/ct2/show/NCT00487227" rel="nofollow noreferrer">ClinicalTrials.gov</a>.</p>
<p>It's a very interesting study regarding the effect of very low doses of caffeine on cognitive variables. The study is listed as completed but I'm unable to find the study on google, google scholar or pubmed</p>

CC BY-SA 4.0
2021-03-29T02:54:32.827Z
It may not have been published.  Not all papers are accepted for publication.
Arnon Weinberg
<reference-request><clinical-psychology><psychopharmacology>
Cannot find a journal paper on a study on caffeine, even though it is registered at clinicaltrials.gov
CuriousIndeed
# Cannot find a journal paper on a study on caffeine, even though it is registered at clinicaltrials.gov

(Asked by: username_0 on 2021-03-28)

Can somebody help me find the following study:
*Effects of Low Doses of Caffeine on Mood, Physiology and Mental Function*, listed under trial identifier *NCT00487227* on [ClinicalTrials.gov](https://clinicaltrials.gov/ct2/show/NCT00487227).

It's a very interesting study regarding the effect of very low doses of caffeine on cognitive variables. The study is listed as completed but I'm unable to find the study on google, google scholar or pubmed

**Tags:** reference-request, clinical-psychology, psychopharmacology

> **Comments:**
> **username_1**: It may not have been published.  Not all papers are accepted for publication.  

---

## 2 answers

### Answer by username_3 on 2021-03-29. Score: 4 | Accepted answer

See [Caffeine at levels found in decaffeinated beverages is behaviourally active](https://www.sciencedirect.com/science/article/pii/S0195666308000196) *Appetite* Volume 50, Issues 2–3, March–May 2008, Page 559.

It's just a conference abstract though.

> **Comments:**
> **username_0**: Nice!! Thanks a lot!!!  

---

### Answer by username_2 on 2021-03-29. Score: 6

**Short answer**  
[Haskall *et al*., The effects of L-theanine, caffeine and their
combination on cognition and mood, *Biol Psych* (2008); **77**: 113–22](https://www.ponderapharma.com/wp-content/uploads/2014/06/The-effects-of-l-theanine-caffeine-and-their-combination-on-cognition-and-mood.pdf).

**Background**  
Here's some of the detective work I've done:

The principal investigator of this study is listed on your link on [ClinicalTrials.gov](https://clinicaltrials.gov/ct2/show/NCT00487227) as [Andrew Scholey of Northumbria University](http://www.andrewscholey.com/).

Looking on Google Scholar, and searching with the key terms "Andrew + Scholey + Caffeine" and looking for publications *after* the study's '*actual completion date*', as listed on [ClinicalTrials.gov](https://clinicaltrials.gov/ct2/show/NCT00487227), I found an article by Scholey & coworkers, namely:
[Haskall *et al*., *Biol Psych* (2008); **77**: 113–22](https://www.ponderapharma.com/wp-content/uploads/2014/06/The-effects-of-l-theanine-caffeine-and-their-combination-on-cognition-and-mood.pdf).

The study doesn't mention 'ClinicalTrials.gov Identifier: NCT00487227' explicitly, but given the study's senior author (Scholey), the publication date (2008) being a few years after the clinical study's completion date (2005), and the topic of the paper (cognitive effects of caffeine) that closely resembles the clinical trial's topic, I bet this is the article you're after.

Otherwise, I should simply contact Scholey - most researchers appreciate an email enquiry about their work. More often than not they're eager to spread their work across the scientific community.

> **Comments:**
> **username_0**: Thanks for your effort. I doubt the the study you provided is the actual study, because the caffeine levels are very different. (2.5mg, 5mg, 10mg vs. 0mg, 150mg, 150mg & 250mg theanine, 250mg theanine) I will follow your advice and contact the author..  
> **username_2**: @Rubus aha, I hadn't looked that specifically :) Good luck! Please add your own answer here when you find the paper.  

---

