What berberine does in your body and how much to take
Updated · 9 studies cited · 5 products compared
Short answer
Berberine comes from plants. If you have type 2 diabetes or high cholesterol, it can bring down your blood sugar and blood fats. Do not count on it for weight loss. It is not the same as Ozempic.
- What it helps
- Lower blood sugar and blood fats in people with type 2 diabetes or high cholesterol.
- How much
- 1,000 mg a day in the best-known study. That is two 500 mg capsules. We see no reason to go over 2,000 mg a day.
- How long
- Studies checked after 2 to 4 months.
- How sure are we
- Some proof
- Skip it or ask first
- Do not take it if you are pregnant or breastfeeding. Ask your doctor first if you take diabetes medicine or any other prescription drug.
See details
In people with type 2 diabetes, berberine lowers blood glucose and HbA1c, and it brings triglycerides down.24 Weight loss is small. A 2026 meta-analysis put it at 0.88 kg on average.7 Many of the trials were of limited quality, so the size of these effects is uncertain.6
1 g a day in a well-known 3-month trial.1 Glucose effects faded above 2 g a day3
Avoid it in pregnancy and while breastfeeding. Ask first if you take diabetes medication or any prescription drug.
How does berberine work in your body?
Your cells have tiny power plants that make energy. Berberine slows them down a bit. Your cells then feel low on energy, so they pull in more sugar from your blood. It also seems to help your body clear extra fat from your blood. It may change the germs that live in your gut too. Scientists are still working out the full story.
See details
The mechanism is still being worked out. A leading explanation is that berberine partly inhibits enzymes in the mitochondria, and that this switches on AMPK, the insulin receptor, and the LDL receptor.5 It also changes the makeup of the gut bacteria, and this may explain part of the effect. In the 116-person trial, a direct test of insulin sensitivity improved after treatment but did not differ significantly from placebo (p = 0.063).1
What does berberine do, and how much does it help?
Most of this was tested in people with type 2 diabetes or high cholesterol. If you are healthy, the change may be smaller.
Blood sugar
Helps someBlood sugar came down in people with type 2 diabetes. For them, the drop was big enough to matter. Some of the studies were not very good, so the real effect may be smaller.
How long: Seen after about 3 months.
See details
Some proof
In a trial of 116 people with type 2 diabetes and high cholesterol, 1 g a day for three months took fasting glucose from 7.0 to 5.6 mmol/L (about 126 to 101 mg/dL) and HbA1c from 7.5% to 6.6%.1 Larger pooled analyses show a smaller average drop in HbA1c, 0.54 to 0.73 points.32 Those are meaningful numbers for someone with diabetes, though the trials vary a good deal in quality.
The 116-person trial ran for three months. In a pooled subgroup analysis the effect became unremarkable after 90 days.3
Blood fats
Helps someIt lowers one kind of blood fat, called triglycerides, by a modest amount. We are less sure it lowers "bad" cholesterol when you take it alone.
How long: Seen after 2 to 4 months.
See details
Some proof
Across 41 trials and 4,838 people, products containing berberine lowered triglycerides by about 19 mg/dL and LDL by about 15 mg/dL. The picture changes when you look at berberine alone. Triglycerides still fell by about 17 mg/dL, but the 9 mg/dL drop in LDL was no longer statistically clear.4 In the lab, berberine activates the LDL receptor, which is how it would be expected to clear LDL from the blood.5
These trials ran for 8 to 18 weeks.
Weight
Helps a littleYou will lose very little, if any. The nickname "nature's Ozempic" goes far past what the studies show.
Liver
Not sure yetPeople with a fatty liver had better liver test results. In people who were overweight, the tests did not change. So it may only help if your liver tests are already high.
Stomach and bowels
Possible side effectSome people get constipated. An upset stomach can happen too. Studies found no serious problems, but they were not built to catch rare ones.
How much berberine should you take?
Many people in the studies took 1,000 mg a day. Taking more than 2,000 mg did not seem to work better. If a label says 500 mg per capsule, two capsules is the study amount.
Plain berberine or a special form?
Most products use plain berberine, often listed as berberine HCl. Some use a special form made to soak in better, called phytosome. These have less in each capsule, so you can't compare them by the number on the label. Skip mixes with many herbs. If something changes, good or bad, you won't know which one did it.
See details
Standard products use berberine HCl. Phytosome products bind it to phospholipids to improve absorption and are sold at lower doses, so a dose from an HCl trial doesn't carry over directly.
Be wary of blends with bitter melon or banaba. If you have a side effect or a good result, you won't know which ingredient caused it.
Best berberine supplements by study dose and cost a day
The ones closest to what the studies used come first. If they tie, the one with more reviews comes first.
Cost a day is for 1,000 mg a day, the amount from the best-known study.
| Product | Cost a day | Lasts |
|---|---|---|
| California Gold Nutrition, Berberine HCl, 500 mg, 120 Veggie Capsules2 capsules a day (label says 1) | $0.57Lowest | 60 days |
| Natural Factors, WellBetX Berberine, 500 mg, 120 Vegetarian Capsules2 capsules a day | $0.58 | 60 days |
| Nutricost, Berberine, 600 mg, 60 Capsules2 capsules a day, which gives 1,200 mg | $0.63 | 30 days |
| Solaray, Vital Extracts, Berberine, 500 mg, 60 VegCaps2 capsules a day (label says 1) | $0.80 | 30 days |
| California Gold Nutrition, Berberine Advanced, Berbevis Phytosome, 550 mg, 60 Veggie Capsules1 capsule a day, as the label says · Different form, hard to compare | $0.47 | 60 days |
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1
Natural Factors, WellBetX Berberine, 500 mg, 120 Vegetarian Capsules
2 capsules: 1,000 mg berberine HCl
Two capsules give the amount from the best-known study. It also has the most reviews here.
View on iHerb$0.58 a day
2 capsules a day
$34.97 on iHerb for 60 days -
2
Solaray, Vital Extracts, Berberine, 500 mg, 60 VegCaps
1 capsule: 500 mg berberine HCl
Only berberine, nothing else. Two capsules give the study amount.
View on iHerb$0.80 a day
2 capsules a day (label says 1)
$23.99 on iHerb for 30 days -
3
California Gold Nutrition, Berberine HCl, 500 mg, 120 Veggie Capsules
1 capsule: 500 mg berberine HCl
Only berberine, nothing else. The label says one capsule, which is half the study amount.
View on iHerb$0.57 a day Lowest cost here
2 capsules a day (label says 1)
$33.94 on iHerb for 60 days -
4
Nutricost, Berberine, 600 mg, 60 Capsules
2 capsules: 1,200 mg berberine HCl
A little more than the study amount, but still under 2,000 mg.
View on iHerb$0.63 a day
2 capsules a day, which gives 1,200 mg
$18.95 on iHerb for 30 days -
5
California Gold Nutrition, Berberine Advanced, Berbevis Phytosome, 550 mg, 60 Veggie Capsules
1 capsule: 550 mg berberine phytosome
A special form made to soak in better. You can't compare it by the number on the label.
View on iHerb$0.47 a day
1 capsule a day, as the label says
$28.15 on iHerb for 60 days
Amounts and US prices come from each product's iHerb page on November 6, 2026. Prices change often and differ by country, so check the current price on iHerb. Shipping and tax are not included. How we rank products
Common questions
How long does berberine take to work?
Studies checked blood sugar and blood fats after 2 to 4 months. We don't know much about the first few weeks.
See details
Trials typically checked blood sugar and lipids after 8 to 18 weeks.4 We don't have good data on the first few days or weeks.
Can I take berberine with metformin?
Only if your doctor says yes. The two together lower blood sugar more, and it can drop too low.
See details
Combining berberine with glucose-lowering drugs worked better than either alone in pooled data,3 and that same additive effect raises the risk of low blood sugar. Please do this only with your doctor's guidance.
Does berberine help with weight loss?
Only a tiny bit.
See details
Only slightly on average, 0.88 kg in the most recent analysis.7
Is berberine safe?
Most people in studies had only mild problems, like constipation. But it can mix badly with some drugs, and you should not take it while pregnant.
Who should not take berberine?
- Pregnant or breastfeeding: do not take it. It is not thought to be safe for newborns.
- Diabetes medicine: your blood sugar could drop too low.
- Other prescription drugs: it can change how some drugs work. Ask a pharmacist, above all about blood thinners and cyclosporine.
- It can cause constipation, loose stools, or an upset stomach.
Studies we used
See all 9 studies
- Clinical trial
116 people with type 2 diabetes and high cholesterol, 1 g a day for 3 months. HbA1c fell from 7.5% to 6.6%.
Treatment of type 2 diabetes and dyslipidemia with the natural plant alkaloid berberine. J Clin Endocrinol Metab, 2008. PubMed 18397984
- Meta-analysis or review
Type 2 diabetes. HbA1c fell by 0.73 points, with lower fasting and after-meal glucose.
The Effect of Berberine on Metabolic Profiles in Type 2 Diabetic Patients: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Oxid Med Cell Longev, 2021. PubMed 34956436
- Meta-analysis or review
28 studies, 2,313 people. Effects became unremarkable beyond 90 days, above 2 g a day, and over age 60.
Effects of berberine on blood glucose in patients with type 2 diabetes mellitus: a systematic literature review and a meta-analysis. Endocr J, 2019. PubMed 30393248
- Meta-analysis or review
41 trials, 4,838 people. Modest lipid effects; LDL drop with berberine alone was not statistically clear.
Impact of Berberine or Berberine Combination Products on Lipoprotein, Triglyceride and Biological Safety Marker Concentrations in Patients with Hyperlipidemia: A Systematic Review and Meta-Analysis. J Diet Suppl, 2024. PubMed 37183391
- Guideline or expert review
Review of how berberine acts on mitochondria, AMPK, LDL and insulin receptors, and gut bacteria.
Berberine in the treatment of metabolism-related chronic diseases: A drug cloud (dCloud) effect to target multifactorial disorders. Pharmacol Ther, 2020. PubMed 32001311
- Meta-analysis or review
27 trials, 2,569 people. No serious side effects, but limited study quality.
Meta-analysis of the effect and safety of berberine in the treatment of type 2 diabetes mellitus, hyperlipemia and hypertension. J Ethnopharmacol, 2015. PubMed 25498346
- Meta-analysis or review
23 articles. Average weight loss was 0.88 kg.
The effect of berberine on obesity indices: a systematic review and meta-analysis. Int J Obes (Lond), 2026. PubMed 41310257
- Meta-analysis or review
12 studies. Average weight loss was 2.07 kg, with no significant effect on ALT and AST.
The effect of berberine supplementation on obesity parameters, inflammation and liver function enzymes: A systematic review and meta-analysis of randomized controlled trials. Clin Nutr ESPEN, 2020. PubMed 32690176
- Meta-analysis or review
10 trials, 811 people with fatty liver disease. Liver enzymes and lipids improved.
The clinical efficacy and safety of berberine in the treatment of non-alcoholic fatty liver disease: a meta-analysis and systematic review. J Transl Med, 2024. PubMed 38429794