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.
|
Notes |
|---|---|---|---|---|
| Bacopa monnieri |
All comparative evidence is now gathered in our A-to-Z Supplement Reference. The evidence for each separate supplement is still freely available here. |
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| Cocoa Extract | ||||
| Ginkgo biloba | ||||
| Theanine | ||||
| CDP-choline | ||||
| Centella asiatica | ||||
| D-Serine | ||||
| L-Carnitine | ||||
| Modafinil | ||||
| Nigella sativa | ||||
| Phosphatidylserine | ||||
| Pycnogenol | ||||
| Creatine | ||||
| Fish Oil | ||||
| Marijuana | ||||
| Melatonin | ||||
| Melissa officinalis | ||||
| Red Clover Extract | ||||
| Rhodiola Rosea | ||||
| S-Adenosyl Methionine | ||||
| Peppermint | ||||
| Pueraria lobata | ||||
| Nicotine | ||||