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. NK cells also promote the body?s natural defenses against seasonal immune challenges. In addition, NK cells recognize and eliminate senescent cells that accumulate in aged tissues and create metabolic disturbances. NK cell activity declines with normal aging which can affect immune function. Real-world Immune Support NK cells provide the body?s first, immediate response to previously unknown immune challenges. But NK cell function declines over time. Studies show that enzymatically modified rice bran significantly boosts NK cell activity. So we created a seasonal immune support formula to provide real-world immune protection from the effects of seasonal immune challenges.