Melatonin has a very interesting relationship with blood sugar. First of all, a 12-year-old study conducted by the American medical Association determined that individuals with low levels of melatonin in their bodies were more likely to develop type 2 diabetes. Whether or not increasing melatonin via supplements lowers the risk of diabetes is unfortunately still not known. More studies are needed 1.
Second, individuals suffering from type 1 diabetes sometimes experience higher blood sugar levels after consuming melatonin 2.
What does this mean? If you are a diabetic, we highly urge you to speak with your physician before buying and/or using melatonin.