Things to Know
Also Known As
NK cell, natural killer cell
Natural killer cells can have their population increased by nutritional supplements, which usually (but not always) results in an increase in activity.
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NK cell, natural killer cell
The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect natural killer cell content
Grade | Level of Evidence |
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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.
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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.
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Consistency of research results ?
Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
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Notes |
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Fish Oil |
All comparative evidence is now gathered in our Supplement Goals Reference. The evidence for each separate supplement is still freely available here. |
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Eleutherococcus senticosus | |||
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Garlic | |||
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Holy Basil | |||
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Colostrum | |||
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Hesperidin | |||
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Polypodium leucotomos | |||
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Vitamin E | |||
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Spirulina | |||
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Blueberry | |||
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Trametes versicolor |