CINNAMON, EVEN IN SMALL DOSES, HAS A SUBSTANTIAL EFFECT ON GLUCOSE LEVELS. There is ample evidence that cinnamon can be used to reduce the glycemic index of a meal up to 29%. At four grams per meal or even six grams per day, it can lower not only blood glucose but also LDL cholesterol and triglycerides. Cinnamon weighs in at 2.8 grams per teaspoon, so four grams of cinnamon is about one and a half teaspoons.