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Potentially Harmful Effects of Magnesium Stearate

  Magnesium stearate is formed by adding a magnesium ion to stearic acid. The compound has lubricating properties, which is why it's often used in the making of supplements, as it allows the machinery to run faster and smoother, and prevents the pills or capsules from sticking to each other.

  However, previous research has shown that stearic acid suppresses T cells—your natural killer cells—which are a key component of your immune system. According to that study, stearic acid causes the collapse of cell membrane integrity—an effect that was found to be time and dose dependent—which, ultimately, can destroy cell function.

  In my view, if you're taking a supplement, making sure it's a high quality, natural food-based supplement that does not include potentially harmful fillers and additives such as magnesium stearate.