The cup leaked as I shook up my shake the first time I used it. I've used it twice since thinking it was user error but each time I shake it, several drops of whatever liquid I am using come out of the bottle. As I drive around for work, I've resorted to putting it into a larger 40oz plastic cup to keep milk from getting inside my cooler. Even as the milk sloshes around as I drive (and even as the cup stays completely vertical) there is always milk that has leaked out. It keeps my drink cold, but leaking is inexcusable.*
Note: Individual results may vary. The Food and Drug Administration has not evaluated any statements on this website. Dietary supplement products are not intended to diagnose, treat, cure, or prevent any disease. Advice on treatment or care of an individual patient should be obtained through consultation with a trained health care practitioner.