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The ability to keep focus on chosen targets, the clinical lack of attention is ADD (or ADHD if hyperactivity exists); Attention and/or Focus may be affected by supplements listed on this page.

Research analysis led by Kamal Patel.
All content reviewed by the Examine.com Team. Published:
Last Updated:

Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect attention
Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Outcome Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
grade-b Bacopa monnieri - High See all 3 studies
There is unlikely to be an inherent effect of bacopa on attention, although at least one study noted improvements in attention in persons with attention deficit (ADD).
grade-b Cocoa Extract - Very High See all 3 studies
In assessing the effects of cocoa on mood states, attention does not appear to be significantly altered when compared to placebo.
grade-b Ginkgo biloba - Very High See all 5 studies
Attentional focus and similar parameters (task switching) do not appear to be significantly influenced by ginkgo supplementation.
grade-c Theanine  
grade-c CDP-choline  
grade-c Centella asiatica  
grade-c D-Serine  
grade-c L-Carnitine  
grade-c Modafinil  
grade-c Nigella sativa  
grade-c Phosphatidylserine  
grade-c Pycnogenol  
grade-c Creatine  
grade-c Fish Oil  
grade-c Marijuana  
grade-c Melatonin  
grade-c Melissa officinalis  
grade-c Red Clover Extract  
grade-c Rhodiola Rosea  
grade-c S-Adenosyl Methionine  
grade-d Peppermint  
grade-d Pueraria lobata  
grade-d Nicotine  

All comparative evidence is now gathered in our ​A-to-Z Supplement Reference.

The evidence for each separate supplement is still freely available ​here.