Diabetes

Yes, and the distinction between Ceylon and cassia cinnamon matters significantly for this use. A meta-analysis published in the Journal of the Academy of Nutrition and Dietetics reviewed 11 randomised controlled trials and found that cinnamon supplementation reduced fasting blood glucose by an average of 3 to 5 mmol per litre and improved insulin sensitivity markers. Ceylon cinnamon (Cinnamomum verum) is the preferred form for blood sugar support because it contains negligible coumarin, a compound found in high concentrations in the more common cassia variety that can cause liver damage at supplemental doses with prolonged use.

Ceylon cinnamon, sometimes called true cinnamon, comes from Sri Lanka and has a lighter, more delicate flavour. Cassia cinnamon, which makes up the vast majority of cinnamon sold in supermarkets, is grown in China and Indonesia. The key nutritional difference is coumarin content. Cassia cinnamon contains up to 5mg of coumarin per gram, well above the European Food Safety Authority's tolerable daily intake. Ceylon cinnamon contains only trace amounts. For people taking cinnamon as a daily supplement for blood sugar support, Ceylon is the only form that can be taken consistently at 1200mg doses without liver safety concerns.

Clinical trials studying cinnamon for blood glucose control typically run for 8 to 12 weeks before measuring outcomes. A 2020 study in the journal Nutrients found significant improvements in fasting blood glucose after 8 weeks of daily cinnamon supplementation at doses of 1000mg to 1500mg per day. Our Ceylon cinnamon capsules deliver 1200mg per serving, which falls within this therapeutic range. For best results, take consistently with meals and combine with a balanced diet. Cinnamon supplements are not a replacement for prescribed diabetes medication and should be discussed with your endocrinologist or GP if you manage blood sugar with medication.

Ceylon cinnamon is considered safe for daily supplementation based on available research. Unlike cassia cinnamon, its negligible coumarin content means daily doses of 1200mg do not pose liver risk. Studies have used daily doses up to 6000mg without reported serious adverse effects. However, cinnamon can enhance the blood sugar-lowering effects of insulin and diabetes medications, which could potentially cause hypoglycaemia if doses are not adjusted. This content is for general informational purposes only and does not constitute medical advice. If you manage diabetes with medication, consult your doctor before adding cinnamon supplements to your daily routine.