VoltraBerberine for weight loss: is it "Nature's Ozempic"?
Not by much, if at all. In pooled trials, people taking berberine lost 0.88 kg more than control groups on average [1], and NCCIH, part of the US National Institutes of Health, says "the evidence is not conclusive" [2]; the US Defense Department's Operation Supplement Safety calls the "Nature's Ozempic" claims exaggerated [3]. Berberine can interact with medicines and may be unsafe in pregnancy or while breastfeeding [2].
What the weight-loss trials found
| Berberine vs control | Difference | 95% CI |
|---|---|---|
| Body weight (kg) | 0.88 lower | 0.39 to 1.36 lower |
| BMI (kg/m²) | 0.48 lower | 0.07 to 0.89 lower |
| Waist (unit unclear) | 1.32 lower | 0.41 to 2.24 lower |
| Waist-to-hip ratio | No clear difference (0.01 lower) | 0.03 lower to 0.01 higher |
A 2026 meta-analysis of 23 articles on randomised controlled trials in adults, comparing berberine with control groups [1]. The 95% CI is the range the true average difference probably lies in. The abstract prints the waist result's unit as kg/m², which doesn't fit a waist measurement, so we leave the unit out.
That's an average of under 1 kg. The authors say future trials need to report exactly what berberine product they used (its purity, potency and amounts) and fix common biases such as a lack of blinding and randomisation [1].
The US National Center for Complementary and Integrative Health (NCCIH), part of the National Institutes of Health, answers the question "Will taking berberine help me lose weight?" like this: "Some studies suggest that it might, but the evidence is not conclusive." [2] About a 2022 review that found significant drops in weight and BMI, it says: "Many of the studies included in this review had a high risk of bias, and the outcomes of individual studies were inconsistent." [2] It adds that the amounts and forms of berberine varied widely between studies, that most participants had health problems such as diabetes or fatty liver disease, and that most studies were done in Asian countries [2].
The US Defense Department's Operation Supplement Safety (OPSS) goes further. It points to a review that reported 0.84 kg of weight loss in people with certain diseases who took berberine for up to 18 weeks, and adds: "When low quality studies are excluded, this reported reduction in weight no longer exists." [3]
The MSD Manual's page on goldenseal, a plant that contains berberine, is more positive: "Berberine has also been shown to lower cholesterol, blood pressure, and body weight." [4] NCCIH and OPSS, which weigh the quality of the weight studies, are more cautious [2][3].
Is it "Nature's Ozempic"?
No. OPSS says: "consumers should be aware that claims of berberine as 'Nature's Ozempic' are exaggerated and are not supported by the evidence." [3] Ozempic is "an FDA-approved prescription drug for patients with type 2 diabetes" [3]; berberine is sold as a supplement [5]. For what the GLP-1 medicines did in their trials, and how to eat and train on them, see our guide to GLP-1 medicines.
Blood sugar
NCCIH says there is some evidence that berberine may have a modest effect on blood sugar in people with type 2 diabetes [5]. A 2023 meta-analysis of 20 placebo-controlled trials with 1,761 people found fasting glucose 0.52 mmol/L lower (18 trials) and HbA1c 4.48 mmol/mol lower (7 trials) than with placebo [6]. Its authors call the improvement modest, and say berberine can be considered as an add-on for people who may benefit from a modest improvement and prefer a supplement [6].
A 2022 meta-analysis of 37 studies with 3,048 people with type 2 diabetes reported bigger drops, 0.82 mmol/L in fasting glucose and 0.63 percentage points in HbA1c [7], but it included trials where berberine was combined with diabetes medicines, so it doesn't isolate berberine's own effect [7].
If you take diabetes medicines, the MSD Manual notes that berberine may add to their blood-sugar-lowering effect [4].
Side effects and medicines
- Stomach and gut. Side effects reported in studies are mainly gastrointestinal: nausea, abdominal pain, bloating, constipation or diarrhoea [2]. OPSS says no serious adverse effects have been reported so far, but "Long-term safety data on berberine are lacking." [3]
- Medicines. Berberine may interact with medicines, for example cyclosporine, which is used to prevent the rejection of transplanted organs [2]. In a two-week study in healthy men, berberine reduced the activity of three enzymes the body uses to break down some medicines (CYP2D6, CYP2C9 and CYP3A4), and the body's clearance of one test medicine, midazolam, fell by 27% [8]. So berberine can change how quickly some medicines leave your body. The MSD Manual adds that it may reduce how much losartan, a widely used blood-pressure medicine, is converted to its active form [4]. If you take any medicine, NCCIH says to talk with your health care provider before taking berberine [2].
- Pregnancy, breastfeeding and babies. Berberine has been linked to a harmful build-up of bilirubin in infants, which can cause brain damage; NCCIH says it is likely unsafe for infants and may be unsafe during pregnancy or while breastfeeding [2]. OPSS says: "Berberine should not be taken by anyone who is pregnant, nursing, or plans to become pregnant." [3]
- Children. OPSS says there isn't enough information to know whether berberine is safe for children [3].
- What's in the bottle. OPSS warns that weight-loss products sometimes contain hidden drugs or other potentially harmful ingredients, and that without lab testing there's no way to know what a product actually contains [3].
Sold as a supplement, not as a weight-loss medicine
Berberine is often sold as a herbal dietary supplement and, most recently, promoted as a weight-loss aid [5]. In the US, supplements aren't approved by the Food and Drug Administration (FDA) before they're sold [9]. When one company, Supersmart, said on its website that its berberine products had "multiple benefits for blood sugar and cholesterol", the FDA wrote in a January 2026 warning letter that claims like these made the products drugs, that they were "not generally recognized as safe and effective" for those uses, and that they were therefore "new drugs", which can't legally be marketed without FDA approval [10]. In short, berberine is sold as a supplement, not as an approved weight-loss medicine.
In Voltra
If you take berberine, you can log it in the Eat tab like any food, by searching for it or describing it, and the Coach can answer questions using what you've logged.
Frequently asked
Does berberine help you lose weight?
Not by much, if at all. In pooled trials, people taking it lost 0.88 kg more than control groups on average, and NCCIH, part of the US National Institutes of Health, says the evidence is not conclusive.
Is berberine "Nature's Ozempic"?
No. The US Defense Department's Operation Supplement Safety says those claims are exaggerated and not supported by the evidence. Ozempic is an FDA-approved prescription drug; berberine is sold as a supplement.
Is berberine safe?
Side effects in studies were mainly nausea, stomach pain, bloating, constipation or diarrhoea. It can interact with medicines, long-term safety data are lacking, and it shouldn't be used in pregnancy or while breastfeeding, or given to infants.
Does berberine lower blood sugar?
Modestly. In placebo-controlled trials it lowered fasting glucose by 0.52 mmol/L on average. If you take diabetes medicines, talk to your doctor first: berberine may add to their effect.
Sources
- Elahi Vahed I, Shahir-Roudi E, Nojumi S, et al. (2026). The effect of berberine on obesity indices: a systematic review and meta-analysis. Int J Obes (Lond) 50(1):53–73. Abstract. 23 articles.
- NIH National Center for Complementary and Integrative Health (2023). Berberine and weight loss: what you need to know. Last updated November 2023.
- Operation Supplement Safety, U.S. Department of Defense (2025). Berberine: the hype for “Nature’s Ozempic”. Content current as of 15 December 2025.
- MSD Manual, Consumer Version (2025). Goldenseal. Evidence; drug interactions.
- NIH National Center for Complementary and Integrative Health (2023). In the news: berberine. Last updated June 2023.
- Zhao JV, Huang X, Zhang J, Chan YH, Tse HF, Blais JE (2023). Overall and sex-specific effect of berberine on glycemic and insulin-related traits: a systematic review and meta-analysis of randomized controlled trials. J Nutr 153(10):2939–2950. Abstract. 20 placebo-controlled trials.
- Xie W, Su F, Wang G, et al. (2022). Glucose-lowering effect of berberine on type 2 diabetes: a systematic review and meta-analysis. Front Pharmacol 13:1015045. Abstract. Includes berberine combined with diabetes medicines.
- Guo Y, Chen Y, Tan ZR, Klaassen CD, Zhou HH (2012). Repeated administration of berberine inhibits cytochromes P450 in humans. Eur J Clin Pharmacol 68(2):213–217. Abstract. Healthy men, two weeks.
- NIH National Center for Complementary and Integrative Health (2025). Goldenseal. Federal regulation of herbal products. Last updated February 2025.
- U.S. Food and Drug Administration (2026). Warning letter to Supersmart USA, LLC (CMS 706566), 21 January 2026. Unapproved new drugs.
Sources checked on 30 September 2026.
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