Berberine, sold as "nature's Ozempic," lacks rigorous evidence, reviewers say

In 2023, social media users began promoting berberine, a plant compound sold over the counter as a dietary supplement, as "nature's Ozempic" — a low-cost stand-in for semaglutide, the active ingredient in Ozempic and Wegovy ^[2][3]. Interest grew as semaglutide's cost and intermittent shortages made the drug hard for many people to get ^[2]. Academic and government reviewers have since pushed back, saying the weight-loss claims are not supported by rigorous evidence ^[1][2][3].

Berberine is a chemical found in the roots, stems and bark of plants including barberry, tree turmeric, Oregon grape and goldenseal, and has been used in traditional Chinese and Ayurvedic medicine for thousands of years ^[3]. It works differently from GLP-1 drugs, which mimic the GLP-1 hormone to regulate appetite and digestion. Berberine triggers the enzyme AMPK, which controls metabolism and energy ^[1].

UCLA Health says preliminary research suggests berberine may reduce weight, BMI and waist circumference in people with a BMI in the overweight range, 25 to 29.9. In those studies, participants took 1 gram of berberine daily, and weight loss occurred after taking it for at least eight weeks. But most experts agree the amount of weight a person can lose with berberine is unclear, and the evidence is inconclusive ^[1].

The Defense Department's Operation Supplement Safety program put it more bluntly. One review reported a weight reduction of 0.84 kilograms — almost 2 pounds — in people with certain diseases after taking berberine for up to 18 weeks. When low-quality studies were excluded, that reported reduction no longer existed ^[3]. OPSS states that the evidence does not support claims for berberine as the "key to weight loss," and that the safety of long-term use is unknown ^[3].

The American Academy of Family Physicians made a similar point in a July 3, 2023 post ^[2]. A 2018 systematic review of randomized controlled trials found berberine superior to comparison groups for fasting and post-meal glucose levels, but the included trials were rated "low to moderate" quality, and a 2008 pilot study comparing berberine with metformin was very small ^[2]. No large-scale randomized or multicenter clinical trial of the kind new diabetes drugs must undergo to win FDA approval has ever been done for berberine, the AAFP wrote ^[2].

UCLA also describes possible heart and blood-sugar effects. Berberine may lower triglycerides and improve LDL and HDL cholesterol, and a review of studies involving more than 4,600 patients found no difference between berberine and statins for improving LDL, HDL or total cholesterol ^[1].

"There needs to be more gold-standard, randomized, controlled clinical trials to understand the true potential of berberine," said Dana Ellis Hunnes, PhD, MPH, RD, a UCLA Health senior clinical dietitian. "Right now, it's considered a dietary supplement as opposed to a tried-and-true medication" ^[1].

Reported side effects include diarrhea, constipation, nausea, stomach upset and bloating, and headaches have also been reported ^[1][3]. Berberine can interact with medications processed by the liver, including metformin, and may make diabetes drugs more potent; it also interacts with anti-rejection drugs taken after an organ transplant ^[1][2]. OPSS says it should not be taken by anyone who is pregnant, nursing or planning to become pregnant, and that there is not enough information to know whether it is safe for children ^[3]. UCLA notes that berberine can be harmful to infants because it can cause a buildup of bilirubin ^[1].

Why it matters for patients

People comparing berberine with a prescription GLP-1 are comparing a supplement with a drug that has been through FDA review. Berberine is sold as a dietary supplement in the United States, and the FDA does not have authority to approve dietary supplements for safety and effectiveness before they are sold ^[2]. As a result, it is impossible to know for sure whether the ingredients listed on a bottle match what is inside it ^[2][3]. Ozempic, by contrast, is an FDA-approved prescription drug for type 2 diabetes and is not approved for healthy people who want to lose weight ^[3].

Cost and access are the main reasons berberine spread online: semaglutide is expensive and has gone through shortages ^[2]. For patients who take metformin, transplant medications or other drugs metabolized by the liver, the interaction risk is a specific concern ^[1][2]. Long-term safety data for berberine are lacking, so what happens with extended use has not been established ^[3]. UCLA's Hunnes recommends speaking with a primary care physician or a pharmacist before taking berberine ^[1].

What happens next

No large-scale, randomized or multicenter trial of berberine has been reported as of the OPSS article's update on December 15, 2025 ^[2][3]. Hunnes says more gold-standard randomized controlled trials are needed to understand berberine's true potential ^[1]. FDA oversight of supplements is unchanged, with no premarket approval for safety and effectiveness ^[2].