NK Cell Activator™

30 vegetarian tablets Item # 01903

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NK Cell Activator™

30 vegetarian tablets Item # 01903

Our NK Cell Activator™ supports the activity of natural killer (NK) cells to promote a healthy immune response and provide targeted seasonal immune protection.

Non-GMO Vegetarian
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$1.12 / count | 15 - 30 Day Supply
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$1.05/count | 15 - 30 Day Supply

For occasional use this is an excellent immune help.


I have been using LEF products for many years.

Obsessive Health Nut, Dallas, TX

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NK Cell Activator™

30 vegetarian tablets


$1.12/count | 15 - 30 Day Supply

What Is NK Cell Activator?

Our overall immune system can decline over time, especially the activity of NK cells, your body’s first response to unknown immune challenges. NK Cell Activator™ contains 500 mg of a proprietary blend of modified rice bran to strengthen the activity of NK cells with just a few months of use each year.

NK cell activity provides protection against seasonal immune challenges for real-world immune support.

NK Cell Activator™ Benefits

  • Supports the activity of natural killer cells
  • Helps protect against seasonal immune challenges
  • Encourages functional activity of natural killer cells to support the immune system

NK Cells: Your First Line of Defense

NK cells normally provide your body’s first, immediate response to previously unknown immune challenges. Because of their nature, encouraging NK cell activity is imperative as we age and is especially important during the winter season.

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Supports the Activity of Natural Killer Cells

Natural killer (NK) cells function as the body’s first responders. As soon as NK cells sense a potential invasion, they are on the scene to initiate a healthy immune response.1,2 NK cells also promote the body’s natural defenses against seasonal immune challenges.

These statements have not been evaluated by the Food and Drug Administration.
These products are not intended to diagnose, treat, cure, or prevent any disease.

Serving Size 1 vegetarian tablet

Amount Per Serving

Proprietary Enzymatically Modified Rice Bran

500 mg

Other ingredients: microcrystalline cellulose, maltodextrin, dicalcium phosphate, croscarmellose sodium, stearic acid, silica, hydroxypropyl cellulose, coating (hydroxypropyl methylcellulose, glycerin), vegetable stearate.

Contains wheat.


Dosage and Use
  • Take one (1) tablet one to two times daily with food, or as recommended by a healthcare practitioner.
  • Do not purchase if outer seal is broken or damaged.
  • When using nutritional supplements, please consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.

To report a serious adverse event or obtain product information, contact 1-866-280-2852.

Actual Size

Pill Size Image
  1. J Allergy Clin Immunol. 2013;132(3):536-544.
  2. Nat Rev Immunol. 2019; 19(5):282-290.
  3. J Leukoc Biol. 2019;105(6): 1275-1282 
  4. Exp Ther Med. 2018;15(3): 2313-2320
  5. Daiwa Pharmaceutical Co., Ltd. Nk Cell Immunomodulatory Function by Modified Arabinoxylan Rice bran (MGN-3/Biobran) at Low Concentration (500 mg/day = 7 mg/kg/day). 2012. Unpublished Study.
  6. Cancer Immunol Immunother. 2013;62(3):437-445.

Product reviews are provided for informational purposes only and reflect solely the views and opinions expressed by the contributors and not those of Life Extension. We do not verify or endorse any claims made in these reviews. Full product reviews disclaimer



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