... .1% and GABA0.2mg/gSeveral studies have shown that red yeast rice lowers blood preesure, blood fat, and LDL ("bad") cholesterol ... should take less or not take red yeast rice.3 Studies have shown that red yeast rice side effects are mild, like headaches, heartburn ... aches and weakness. 4 These people should not take red yeast rice: people with kidney disease, liver disease, thyroid problems, or ...