Skip to content
Back to Blood Sugar Support

ingestible · for blood sugar support

Berberine

Reviewed by the Nimbera editorial team · Last updated May 2026

A 2021 meta-analysis in Oxidative Medicine and Cellular Longevity (Guo et al., PMC8696197) of 46 RCTs with 4,158 participants found berberine significantly reduced HbA1c by -0.75% and fasting plasma glucose by -0.89 mmol/L in type 2 diabetes patients.$25-$50 for a month's supply at 1500 mg/day.

How to use

Take 500 mg three times daily with meals (total 1500 mg/day). Take with food to reduce GI side effects. Allow 8-12 weeks to assess full effect. Do not exceed 1500 mg/day without medical guidance.

How it works

Berberine activates AMP-activated protein kinase (AMPK), an enzyme that acts as a cellular energy sensor and promotes glucose uptake in muscle cells. It also inhibits intestinal alpha-glucosidase and reduces hepatic glucose production, with a mechanism similar in some respects to metformin.

Where to buy

Thorne Berberine, NOW Foods Berberine, or Integrative Therapeutics Berberine at Amazon, iHerb, or health food stores.

Typical cost: $25-$50 for a month's supply at 1500 mg/day.

Safety notes

Berberine is not approved as a drug and should not replace metformin or other prescribed medications. It may lower blood sugar dangerously when combined with diabetes medications. Can cause significant GI side effects (nausea, diarrhoea, cramping), especially early on. Do not use during pregnancy or breastfeeding. May interact with cyclosporine and certain antibiotics. Consult your doctor before use if on any medications.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Guo et al., Berberine metabolic profiles in T2D meta-analysis, Oxid Med Cell Longev, 2021

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.