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Natural Killer Cell Activity

Natural Killer Cell Activity refers to the ability of natural killer cells to do their actions in the body, and this activity can be increased either by increasing cell count of promoting activity in a direct stimulatory manner.

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 natural killer cell activity
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
grade-b Fish Oil Minor High See all 3 studies
Although there do not appear to be changes in the amounts of NK cells in the body following fish oil, their activity appears to be a tad reduced
grade-c Garlic Minor Moderate See 2 studies
There is an increase in NK cell activity alongside the increase in NK cell content, although it is not sure if there is an inherent increase in NK cell activity if you control for the increase in cell content.
grade-c Colostrum - - See study
The phagocytic activity of natural killer cells does not appear to be modified with supplementation of colostrum relative to whey control.
grade-c Glutathione  
grade-c Hesperidin  
grade-d Ganoderma lucidum  
grade-d Spirulina  
grade-d Ashwagandha  
grade-d Trametes versicolor  

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

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