One of the most important active ingredients in cinnamon is cinnamaldehyde. It’s used in flavorings and fragrances. It may be responsible for some of cinnamon’s possible health benefits. Research shows cinnamon may be good for people with diabetes, it may also lower cholesterol in people with diabetes. It’s sometimes used for irritable bowel syndrome or other stomach or intestinal problems. It’s been suggested that cinnamon also might help with: Heart disease, Alzheimer’s disease, Cancer, HIV, Infection, Tooth decay and Allergies.