Quick answer: Several supplements have research for blood sugar support, including berberine, myo-inositol, cinnamon, alpha-lipoic acid, chromium and magnesium. They work best on top of a whole-food diet, post-meal walks and strength training. Because they can lower blood sugar, people taking diabetes medications should use them only with their prescriber’s guidance.
Key takeaways
Berberine, myo-inositol, cinnamon, alpha-lipoic acid, chromium and magnesium all have some research for blood sugar support.
They work best on top of a whole-food diet, walks after meals and strength training.
Because they can lower blood sugar, people on diabetes medications should use them only with their prescriber’s guidance.
Supplements with research
Berberine supports insulin sensitivity; interacts with many medications. Myo-inositol supports insulin signaling, especially in PCOS, and cinnamon (Ceylon) may modestly lower post-meal glucose. Alpha-lipoic acid supports glucose uptake and nerve health.
Chromium supports insulin action, though the evidence is mixed. With magnesium, low levels are common with insulin resistance. Bitter melon and gymnema are traditional herbs for blood sugar, and omega-3s help lower triglycerides.
Amounts should be individualized.
Habits that matter more than any supplement
Eat protein, fat and fiber first and carbs last, and take a 10 to 15 minute walk after meals. Strength train at least three times a week, and finish dinner a few hours before bed. The full habit guide is here: managing blood sugar naturally.
Is testing helpful?
Fasting glucose and insulin, A1C and lipids help track progress. Some people use a continuous glucose monitor to learn their patterns. Functional labs are optional. They can be helpful in more complex cases.
Safety
Supplements that lower blood sugar can add to the effect of diabetes medications and cause low blood sugar. Berberine is not recommended in pregnancy. Cassia cinnamon contains coumarin, which can affect the liver in large amounts. Check every supplement with your prescriber.
Blood sugar and healthy aging
Chronically high glucose and insulin drive glycation, strain mitochondria, raise inflammation and keep nutrient-sensing pathways in overdrive. Steadier blood sugar supports healthier aging. Related: an integrative approach to type 2 diabetes and insulin sensitivity.
When to see a naturopathic doctor
It may be time to see a naturopathic doctor if you have prediabetes or type 2 diabetes, or if you want to add supplements safely with your medications. The same is true if your A1C is rising despite good habits, or if you have PCOS or insulin resistance.
See a medical provider promptly for blood sugar readings that are very high or very low, confusion, extreme thirst with vomiting, or fainting.
What the research shows
Berberine has the strongest blood sugar data among supplements. In a 2008 pilot study by Yin and colleagues, 36 adults with new type 2 diabetes took berberine or metformin for three months, and HbA1c fell from 9.5% to 7.5% with berberine, similar to metformin. About a third of participants in the second part of the study had temporary stomach upset. The studies were small and short, and berberine can interact with diabetes medicines and others.
Alpha-lipoic acid has been studied for diabetic nerve symptoms. In the SYDNEY 2 trial, 181 people with diabetic nerve pain took 600, 1,200 or 1,800 mg of alpha-lipoic acid or a placebo for five weeks. Symptom scores fell about 51% with 600 mg compared with 32% on placebo, and higher doses added nausea without more benefit. The trial was short and measured symptoms, not blood sugar.
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Questions to bring to your clinician
These questions can help you get the most out of your next visit.
Could any of these blood sugar supplements interact with my current medications?
Is blood sugar supplements a reasonable choice alongside my current medications and supplements?
Would it be worth checking any labs before I try blood sugar supplements, or is my history enough to decide?
What would tell us that blood sugar supplements is working well for me, and how long should we wait before reviewing it?
Frequently asked questions
What is the best supplement for blood sugar?
Berberine and inositol are among the most studied. The right choice depends on your health and medications.
Does cinnamon lower blood sugar?
Some studies show modest effects, but results are mixed.
Can I take berberine with metformin?
Both lower blood sugar. Only combine them with your prescriber’s guidance.
How long do blood sugar supplements take to work?
Changes in fasting glucose may appear in weeks; A1C reflects about three months.
Sources
- Yin J, Xing H, Ye J. Efficacy of berberine in patients with type 2 diabetes mellitus. Metabolism 2008. PMID: 18442638. https://pubmed.ncbi.nlm.nih.gov/18442638/
- Ziegler D, Ametov A, Barinov A, et al. Oral treatment with alpha-lipoic acid improves symptomatic diabetic polyneuropathy: the SYDNEY 2 trial. Diabetes Care 2006. PMID: 17065669. https://pubmed.ncbi.nlm.nih.gov/17065669/
- Allen RW, et al. Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis. Ann Fam Med 2013. PMID: 24019277. https://pmc.ncbi.nlm.nih.gov/articles/PMC3767714/
- Dong JY, et al. Magnesium intake and risk of type 2 diabetes: meta-analysis of prospective cohort studies. Diabetes Care 2011. PMID: 21868780. https://pmc.ncbi.nlm.nih.gov/articles/PMC3161260/
- Reynolds AN, et al. Advice to walk after meals is more effective for lowering postprandial glycaemia in type 2 diabetes mellitus. Diabetologia 2016. PMID: 27747394. https://pubmed.ncbi.nlm.nih.gov/27747394/
- NIH Office of Dietary Supplements: Chromium (Consumer Fact Sheet)
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting supplements or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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