Kourtney Kardashian swears by this $33 product to keep the flu away all year long

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It should go without saying, but Hollywood's most famous celebs aren't immune to the flu — just ask Kourtney Kardashian. The reality star and self-proclaimed "green queen" holds her personal health and wellness dear to her heart, so it should come as no surprise that she has found the secret recipe to dodging the harsh effects of flu season.

In a recent interview with New York Magazine, the 40-year-old mother of three revealed that she keeps her immune system on 100 thanks to the Lypo-Spheric Vitamin C Packets. Introduced to her by her mother, Kris Jenner, about 10 years ago, Kourtney explained that she swears by these and takes them daily as her main source of vitamin C. They're also insanely affordable at $32.95 for a box of 30 packets!

Shop: Lypo-Spheric Vitamin C Packets, $32.95

"I never take those sugary, to-go vitamin C — I think this is like, the real deal," she said. "I try to take it every morning, but if I feel slightly like I'm getting sick and 100-percent when I'm on an airplane, I take it."

The influencer and reality TV mainstay added that she even ensures that she has these packed in advance so she never forgets them during travel.

"When I'm traveling, just as an extra boost, I'll even take up to two a day. I keep my travel bags packs always, like, I have one that's all supplements, and I keep that in there," she continued. "And I think they're great for skin too, like internally, for your immunity, for so many different things, I love them."

With all of the germs flying around this flu season, we may have to thank Kourtney for putting us on to this liquid gold.