What Is Berberine? A Plain-English Guide

The bitter plant compound getting a lot of attention, and what to know before you try it.

Berberine is a yellow, bitter-tasting compound found in the roots, stems and bark of several plants, including goldenseal, barberry, Oregon grape and Chinese goldthread. It has been used in traditional Chinese and Ayurvedic medicine for centuries.

Why researchers are interested

Much of the modern research focuses on berberine's effect on AMPK, an enzyme that acts like a master energy sensor in your cells. AMPK helps regulate how the body uses glucose and fat. Studies have looked at berberine's role in glucose metabolism, lipid levels and gut bacteria, though many trials are small and more research is needed.

How people take it

Berberine is usually taken in divided doses with meals, because it is processed quickly by the body. Taking it with food may also reduce stomach upset.

Possible side effects

• Digestive complaints such as cramping, constipation, diarrhea or gas are the most common, especially at first.
• Starting with a lower amount and taking it with meals often helps.

Who should be careful

Berberine is not recommended during pregnancy or breastfeeding. It can interact with a number of medications, including drugs for blood sugar, blood pressure and blood thinning, and medicines processed by certain liver enzymes. If you take any prescription medication, talk with your doctor or pharmacist first.

The bottom line

Berberine is one of the better-studied plant compounds for metabolic health, but it is not a replacement for medical care. Give any supplement time, track how you feel, and keep your doctor in the loop.