Best Supplements for Blood Sugar: Berberine, Fiber and More, Ranked
Berberine and psyllium have the best evidence for lowering blood sugar; cinnamon and chromium are weaker. See doses, interactions and when to see a doctor.
By the editorial team · Updated Oct 14, 2026 · 4 sources cited
The best supplements for blood sugar are berberine and soluble fiber such as psyllium, both of which lowered fasting glucose and HbA1c in meta-analyses. Cinnamon and chromium have weaker, mixed evidence. None replace diabetes medication, and several can drop blood sugar too far when combined with it, so involve your doctor.
Evidence-ranked options
| Supplement | Evidence | Typical dose | Notes |
|---|---|---|---|
| Berberine | B | 500 mg 2–3 times a day with meals | Lowered HbA1c in trials; many drug interactions. |
| Psyllium fiber | B | 5–10 g a day before meals | Blunts after-meal glucose spikes; larger effect in people with diabetes. |
| Magnesium (if low) | C | 100–350 mg a day | Low magnesium is common in type 2 diabetes. |
| Cinnamon | C | 1–6 g a day in studies | Inconsistent results; cassia cinnamon contains coumarin. |
| Chromium | C | 200–1,000 mcg a day in studies | Small, inconsistent effects. |
A: strong · B: moderate · C: limited or mixed · D: good evidence of no benefit. See the evidence database.
Start with the basics
Lifestyle changes cut the risk of prediabetes progressing to diabetes more than any supplement. See 10 natural ways to lower blood sugar for practical steps, and check your risk with our diabetes risk score.
Safety
- Watch for low blood sugar if you take insulin or sulfonylureas: shakiness, sweating, confusion.
- Berberine isn't safe in pregnancy or breastfeeding.
- Tell your care team about every supplement before HbA1c checks or medication changes.
For dosing details, read berberine dosage and timing.
Ingredient guides
Related guides & comparisons
Berberine vs Metformin: How Do They Compare for Blood Sugar?
Berberine lowered blood sugar like metformin in small trials, but metformin has decades of safety data. Compare evidence, side effects and interactions.
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Semaglutide produced about 15% weight loss in trials; berberine's effect is a few pounds. Compare how they work, results, side effects, cost and safety.
Dosing & SafetyCan You Take Berberine Long-Term? Safety, Side Effects and Interactions
Most berberine studies lasted 3–6 months. See what's known about longer use, common side effects, important drug interactions and who should avoid berberine.
Dosing & SafetyMagnesium Deficiency Symptoms: Early Signs, Causes and Who's at Risk
Early magnesium deficiency causes fatigue, weakness, nausea and poor appetite; severe cases bring cramps, tingling and heart rhythm changes.
Articles10 Natural Ways to Lower Blood Sugar
Walking after meals, more fiber, weight loss, better sleep and fewer refined carbs lower blood sugar. See 10 evidence-based steps and which supplements help.
Frequently asked questions
Can supplements reverse diabetes?
No supplement reverses diabetes. Weight loss, diet and activity can bring blood sugar back to normal for some people; medication is often needed.
Is it safe to take berberine with metformin?
Only with your doctor's guidance, because together they can cause low blood sugar.
Sources
- NCCIH: Diabetes and Dietary Supplements: What You Need To Know
- Xie W et al. Glucose-lowering effect of berberine on type 2 diabetes: a systematic review and meta-analysis. Front Pharmacol. 2022
- Gholami Z et al. The effect of psyllium on fasting blood sugar, HbA1c, HOMA IR, and insulin control: a GRADE-assessed systematic review and meta-analysis. BMC Endocr Disord. 2024
- MedlinePlus: Prediabetes
Educational content, not medical advice. Read our medical disclaimer.