Blood Sugar Supplements: Cinnamon, Berberine, Chromium and Gymnema Compared
Educational guide · Last updated: October 4, 2026 · Not medical advice.
Key takeaways:
- These ingredients show small or mixed effects on blood sugar in studies.
- They can interact with diabetes medicines and cause low blood sugar.
- Supplements do not replace diabetes care. Talk to your doctor first.
The ingredients
- Cinnamon: small reductions in fasting glucose in some studies; results are inconsistent. Cassia cinnamon contains coumarin, which can stress the liver in large amounts. Ceylon cinnamon contains much less.
- Berberine: studied for blood sugar and cholesterol. It can interact with several medicines and is not advised in pregnancy.
- Chromium: a trace mineral involved in insulin action. Benefits are clearer in people who are deficient, which is uncommon.
- Gymnema: an herb that may lower glucose and can add to the effect of diabetes medicines.
Safety first
Combining several blood-sugar-lowering ingredients with insulin or diabetes pills can cause low blood sugar. Never change your treatment without your doctor.
What helps most
Food quality, regular movement, good sleep, a healthy weight and the care plan from your doctor have the strongest support. See our independent reviews of Gluco6 and Phytomem One to see how products using these ingredients compare with their claims.
Sources to read next
- NCCIH pages on cinnamon, berberine and diabetes and dietary supplements
- NIH Office of Dietary Supplements: chromium fact sheet
This article is for education only and does not replace advice from your doctor or pharmacist. Healthnilo earns commissions from some links on this site; see our Affiliate Disclosure and Editorial Policy.
Related: Gluco6 review · Phytomem One review · All guides