The 5 Best Berberine Supplements of 2026, Ranked on Their Labels
We read the labels of the four most-reviewed berberine bottles on Amazon and Dosera's, and scored them on berberine a day, capsules, label clarity and cost. Dosera came first. Nature's Bounty is the cheapest bottle, and Thorne has the best testing seal.
Every score here is ours. We earn money when you buy through links on this page, and the scores stay the same either way. How we’re funded
- Bottles compared on their labels
- 5
- Amazon reviews on the four rival bottles
- 26,876
- Cheapest 30 days at 1,200 mg a day
- $21.33
- Widest gap in the cost of 30 days
- $22.67
The short answer
Dosera wins on the label: 1,200 mg of berberine HCl in two capsules for $21.33
Four of the five bottles use plain berberine HCl, the form the studies tested. The difference is how much you get per capsule, how many capsules that takes, and what 30 days costs. Dosera scored 88 of 100.
- Dosera came first: 600 mg per capsule, 1,200 mg a day, every amount printed, $0.59 per 1,000 mg at $21.33 a bottle.
- NOW came second with the same 1,200 mg a day, but in three large bovine-gelatin softgels with 700 mg of MCT oil each.
- The honest caveat: at the store's single-bottle price, NOW, Nature's Bounty and Toniiq all cost less per 1,000 mg than Dosera.
All 5, highest score first
- 1Dosera Berberine HCl 1,200 mg + Ceylon CinnamonA · 88
- 2NOW Berberine Glucose SupportB+ · 79
- 3Nature's Bounty Berberine 1000mgB+ · 77
- 4Toniiq Berberine HCl 500 mgB · 74
- 5Thorne Berberine Dual ActionC+ · 61
See the Dosera bottle ($21.33 a bottle) »or compare all 5 side by side
Grade A · 88 of 100
Dosera Berberine HCl 1,200 mg + Ceylon Cinnamon
★ 4.8 from 2,214 reviews on the maker's page
60 capsules · 30 days
- 600 mg per capsule, 1,200 mg a day in 2 capsules
- 97% berberine HCl plus Ceylon cinnamon and chromium
- Every amount printed, lab-tested every batch
The $19.98 bottle on Amazon is 500 mg a capsule, so 1,200 mg a day costs $23.98 a month and runs out in 25 days. Dosera is 600 mg a capsule, $21.33 a month at 1,200 mg.
$21.33 a bottlefree US shipping
Check price →Sold direct by Dosera · 30-day money-back guarantee, nothing to send back · free US shipping
or see the table first ↓Why is picking a berberine bottle so hard?
"Which brand do you take?" is the most asked question in every berberine thread we read. People are "not sure which brand to trust", so they buy "some Amazon brand that had good reviews lol" and hope. Most of them were told their A1c is borderline and want their numbers down before the next lab.
Then the bottle arrives and the label surprises them. "Listed as 1000 mg but that is for one serving. The serving is 2 capsules." Or the dose turns out to be a choice, one to three capsules, with no one to tell them which. One forum member warned: "You have to be very careful where you buy it as some of brands have little or no berberine in them and the best have nearly 100% purity." Lab tests back that up. In December 2023 NOW tested 33 berberine products bought on Amazon and Walmart.com, and 18 held under 40% of the label [6]. In October 2025 SuppCo tested 13 and 7 failed [8].
Reviews cannot settle it, because every bottle here has thousands of 5-star reviews and a 4.4 or 4.5 rating. Labels can. The mg per capsule, the number of capsules a day, what else is in the capsule and the price for 30 days are printed on every bottle. So that is what we scored.
All 5 side by side
| Rank | Bottle | Score | Berberine a day | Capsules a day | Also in the capsule | Cost for 30 days |
|---|---|---|---|---|---|---|
| 1 | Dosera Berberine HCl 1,200 mg + Ceylon Cinnamon Dosera | A88 | 1,200 mg berberine HCl | 2 (600 mg each) | Ceylon cinnamon 100 mg, chromium 200 mcg | $21.33 at 1,200 mg |
| 2 |  NOW Berberine Glucose SupportNOW | B+79 | 1,200 mg berberine HCl | 3 softgels (400 mg each) | MCT oil 700 mg per softgel | $21.99 at 1,200 mg |
| 3 |  Nature's Bounty Berberine 1000mgNature's Bounty | B+77 | 1,000 mg berberine HCl | 2 (500 mg each) | None | $19.98 at 1,000 mg; about $24 at 1,200 mg |
| 4 |  Toniiq Berberine HCl 500 mgToniiq | B74 | 500 to 1,500 mg berberine HCl, your choice | 1 to 3 (500 mg each) | None | $29.97 at 1,500 mg; about $24 at 1,200 mg |
| 5 |  Thorne Berberine Dual ActionThorne | C+61 | About 600 to 640 mg berberine (1,000 mg label total) | 2 to 4 | Phospholipid carrier only | $44.00 at 2 a day; $88.00 at 4 |
1Dosera Berberine HCl 1,200 mg + Ceylon CinnamonA
- Berberine a day
- 1,200 mg berberine HCl
- Capsules a day
- 2 (600 mg each)
- Also in the capsule
- Ceylon cinnamon 100 mg, chromium 200 mcg
- Cost for 30 days
- $21.33 at 1,200 mg
2NOW Berberine Glucose SupportB+
- Berberine a day
- 1,200 mg berberine HCl
- Capsules a day
- 3 softgels (400 mg each)
- Also in the capsule
- MCT oil 700 mg per softgel
- Cost for 30 days
- $21.99 at 1,200 mg
3Nature's Bounty Berberine 1000mgB+
- Berberine a day
- 1,000 mg berberine HCl
- Capsules a day
- 2 (500 mg each)
- Also in the capsule
- None
- Cost for 30 days
- $19.98 at 1,000 mg; about $24 at 1,200 mg
4Toniiq Berberine HCl 500 mgB
- Berberine a day
- 500 to 1,500 mg berberine HCl, your choice
- Capsules a day
- 1 to 3 (500 mg each)
- Also in the capsule
- None
- Cost for 30 days
- $29.97 at 1,500 mg; about $24 at 1,200 mg
5Thorne Berberine Dual ActionC+
- Berberine a day
- About 600 to 640 mg berberine (1,000 mg label total)
- Capsules a day
- 2 to 4
- Also in the capsule
- Phospholipid carrier only
- Cost for 30 days
- $44.00 at 2 a day; $88.00 at 4
How we scored the five bottles
We searched Amazon for berberine supplements on October 20, 2026 and took the four bottles with the most reviews: Toniiq, Thorne, NOW and Nature's Bounty. We added Dosera's bottle. For each one we read the Supplement Facts panel from the brand's own site or a retailer listing, and the 12 most recent 1-star reviews on Amazon.
Each bottle got four scores out of 100: berberine a day at the label serving, capsules a day, label clarity and testing, and cost for 30 days. The weights are below. The index is the weighted total, rounded. Dosera lost the testing line to Thorne, and NOW matched it on dose. The scores decide the order, and we did not move anything by hand.
Berberine a day30%
How much berberine you actually get at the label serving, in the form the studies used (berberine HCl). The blood sugar studies used 900 to 1,500 mg a day.
Capsules a day20%
How many capsules it takes to reach the studied dose, how big they are, and whether one capsule is a sensible half-dose start.
Label clarity and testing25%
Every amount printed, the form stated, no proprietary blend, a per-capsule number, and what the label says about testing.
Cost for 30 days25%
What 30 days costs at 1,200 mg a day, and the cost per 1,000 mg of berberine, using the Amazon prices we saw on October 20, 2026.
- · We did not lab-test any bottle. Every mg figure is the maker's own label, and Dosera's label has not been tested by an outside lab in any source we found.
- · We did not score the cinnamon and chromium in Dosera's capsule. None of the rivals include them, so a score for them would only favour one bottle.
- · We did not score star ratings. Dosera's reviews sit on its own page and the rivals' on Amazon, and the two are not comparable.
- · Amazon prices move. The prices here are what we saw on October 20, 2026, and the cost lines move with them.
The ranking, 1 to 5
Dosera Berberine HCl 1,200 mg + Ceylon Cinnamon
Dosera · Berberine HCl 97%, 1,200 mg a day, 2 capsules
★ 4.8 from 2,214 reviews on the maker's page
The full studied dose in two capsules, every amount printed, and the lowest cost per 1,000 mg at $21.33 a bottle.
Each capsule holds 600 mg of berberine HCl at 97%. Two a day give 1,200 mg, inside the 900 to 1,500 mg range the blood sugar studies used [1, 2, 4]. The label also lists 100 mg of Ceylon cinnamon extract and 200 mcg of chromium. Nothing sits inside a blend.
The 600 mg capsule is why it ranks first on capsules a day. One capsule is a half-dose start, and two split across breakfast and dinner is the full dose. In one 3-month study, 34.5% of people had stomach effects on berberine, and they faded with time [3]. Owners say a slow start is how they avoided that.
It is not perfect. Dosera says every batch is lab-tested, but no outside lab we found has published a test of this bottle, so Thorne beats it on the testing line. At $21.33 a bottle it costs $0.59 per 1,000 mg of berberine, the lowest of the five. Buy one bottle at the store's single-bottle price and NOW, Nature's Bounty and Toniiq all cost less per 1,000 mg. The 30-day money-back guarantee has nothing to send back.
Pros
- 1,200 mg a day of berberine HCl (97%), inside the studied range
- 600 mg per capsule printed, so a one-capsule start is easy
- Every mg listed: berberine, Ceylon cinnamon and chromium, no blend
- $0.59 per 1,000 mg at $21.33 a bottle, the lowest of the five
- 30-day money-back guarantee with nothing to send back, free US shipping
Cons
- Two capsules at two meals. You have to remember the second one.
- No outside lab has published a test of this bottle. The batch testing is the brand's own claim.
- At the store's single-bottle price, three of the four rivals cost less per 1,000 mg.
- It also contains cinnamon and chromium. If you want berberine alone, this is not it.
$21.33 a bottlefree US shipping
Sold direct by Dosera · 30-day money-back guarantee, nothing to send back · free US shipping
NOW Berberine Glucose Support
NOW · Berberine HCl 400 mg + MCT oil 700 mg per softgel, 3 a day
NOW’s listing photo. Not sold here.
The same 1,200 mg a day as Dosera, but it takes three large softgels, each with 700 mg of MCT oil, in bovine gelatin.
Each softgel holds 400 mg of berberine HCl and 700 mg of MCT oil, which NOW says helps absorption. The label says one softgel three times a day with food, so 1,200 mg a day and 90 softgels last 30 days. The shell is bovine gelatin, so it is not vegetarian. NOW ran its own test of 33 berberine products in December 2023 and its product measured 104% of the label [6, 7]. NOW was the tester, not an independent lab.
At $21.99 for 30 days it is $0.61 per 1,000 mg, a near tie with Dosera. The most common theme in its recent 1-star reviews is stomach trouble, in 6 of the 12 we read, with the softgel size and the gelatin close behind. One reviewer wrote: "Pill size suitable for horses. If you manage to get them down prepare for severe diarrhea." Another: "Warning!!! This product contains Bovine Gelatin... Not safe for persons with Alpha Gal!"
Pros
- 1,200 mg a day of berberine HCl, the full studied dose
- Every amount declared, no proprietary blend
- NOW's own 2023 test measured its berberine at 104% of the label [6]
- $21.99 for 30 days, close to Dosera on cost
Cons
- Three softgels a day, and owners call them large
- 700 mg of MCT oil in every softgel, 2,100 mg a day
- Bovine gelatin shell, not vegetarian
- No outside certifier named on the label; the testing is NOW's own
- No cinnamon or chromium
$21.99 on Amazon, 30 days at 1,200 mg
90 softgels · 30 days at 3 a day
Nature's Bounty Berberine 1000mg
Nature's Bounty · Berberine HCl 500 mg per capsule, 2 a day
Nature's Bounty’s listing photo. Not sold here.
The cheapest bottle here, but 200 mg a day less berberine than Dosera, and only the brand's own testing claim.
Two capsules give 1,000 mg of berberine HCl, 500 mg each, with no other active ingredients. That is inside the studied range, at the low end. The directions say take two capsules daily, preferably with a meal, with no mention of splitting them. The label says "Laboratory Tested" but names no outside certifier. At $19.98 it is the cheapest bottle of the five, yet at $0.67 per 1,000 mg it costs more per mg than Dosera or NOW. Matching 1,200 mg a day would take 2.4 capsules and about $24 a month.
The most common 1-star theme is nausea, heartburn or vomiting, in 6 of the 12 recent reviews we read. Bitter taste or loose yellow powder in the bottle came next. One reviewer wrote: "This brand of berberine caused me terrible heartburn. I won't be purchasing again." Another: "apparently you aren't supposed to take 1000mg of berberine in one serving... Totally crashed my blood sugar."
Pros
- Lowest price on the shelf at $19.98 a bottle
- Plain berberine HCl, every amount declared, vegetarian capsules
- Two capsules a day
Cons
- 1,000 mg a day, 200 mg less than Dosera at a higher cost per mg
- Directions say both capsules at once; no slow-start guidance
- "Laboratory Tested" with no certifier named
- Heartburn and nausea lead its recent 1-star reviews
- No cinnamon or chromium
$19.98 on Amazon, 30 days at 1,000 mg
60 capsules · 30 days at 2 a day
Toniiq Berberine HCl 500 mg
Toniiq · Berberine HCl 97%, 500 mg per capsule, 1 to 3 a day
Toniiq’s listing photo. Not sold here.
Good berberine at 97%, but the dose is up to you, and matching Dosera's 1,200 mg costs more and takes three capsules.
Each capsule holds 500 mg of berberine HCl at 97%, the same purity as Dosera. The directions say one capsule with a meal up to three times a day, so you choose between 500 and 1,500 mg. One capsule a day is below the range the studies used [1, 4]. Three a day is 1,500 mg at $29.97 for 30 days, $0.67 per 1,000 mg. The Amazon title says "NSF Certified", which describes the factory. SuppCo notes that product-specific testing is not verified, though Toniiq does publish a certificate of analysis on its own site.
With 9,938 Amazon reviews it is the most reviewed of the five. Its recent 1-star reviews lead with stomach trouble, in 5 of 12, then "did nothing" in 4. One reviewer wrote: "I have never consumed anything that tore up my stomach so bad." Another: "Purchased this 3 times and took it faithfully. It had absolutely no effect."
Pros
- Berberine HCl at 97%, the studied form
- 500 mg capsules let you set your own dose
- Publishes a certificate of analysis on its site
- Most reviewed bottle of the five, 9,938 on Amazon
Cons
- Matching 1,200 mg takes two and a half capsules, so three in practice
- $29.97 for 30 days at three a day, $8.64 more than Dosera
- "NSF Certified" describes the factory, not a published test of this bottle
- One capsule a day, as the label allows, is below the studied range
- No cinnamon or chromium
$29.97 on Amazon, 30 days at 1,500 mg
90 capsules · 30 days at 3 a day
Thorne Berberine Dual Action
Thorne · Berberine HCl 450 mg + phytosome complex 550 mg per 2 capsules
Thorne’s listing photo. Not sold here.
The best testing certification here, and the least berberine for the most money: about 600 to 640 mg a day for $44.
The label reads 1,000 mg per two capsules, but read the next line. 450 mg is berberine HCl. The other 550 mg is a berberine phytosome complex, which its maker Indena standardises to 28 to 34% berberine [9]. So the actual berberine in a serving is about 600 to 640 mg, below the 900 to 1,500 mg the blood sugar studies used [1, 2, 4]. The label does not print the berberine share of the complex. Thorne says the phytosome absorbs better, and we found no study showing it gives better A1c results. The label carries "Contents Certified NSF", a named outside certifier, which is why it scores highest here on testing. Directions say one to two capsules twice a day, so a bottle can last 15 days.
At $44.00 it is $1.47 per 1,000 mg of label berberine, and about $2.37 on actual berberine. Its recent 1-star reviews lead with stomach illness, in 6 of 12, then "did nothing" in 4, two of them tied to the price. One reviewer wrote: "Did absolutelynothing. Pills stick in your throat too total waste of money." Another: "It curbed my appetite but it slowed my digestion so much, I didnt have a bowel movement for over a week."
Pros
- "Contents Certified NSF" on the label, the only named outside certifier of the five
- Vegetarian capsules, no other active ingredients
- 6,706 Amazon reviews and 30K+ bought in the past month
Cons
- About 600 to 640 mg of actual berberine per 2 capsules, below the studied range
- The 1,000 mg headline counts 550 mg of a complex that is 28 to 34% berberine
- $44.00 for 30 days, $22.67 more than Dosera, and $88.00 at the 4-capsule use
- The berberine share of the phytosome is not printed on the label
- No cinnamon or chromium
$44.00 on Amazon, 30 days at 2 capsules a day
60 capsules · 30 days at 2 a day, 15 days at 4
You picked a bottle. What happens next, week by week
- Before day 1Get a baseline. Check your fasting number each morning for a week. Write it down. Without this you will never know whether the bottle did anything.
- Week 1One capsule with food. Start with one 600 mg capsule at your biggest meal. Some gas or looser stools is common at first and usually fades within days.
- Weeks 2 to 4Two capsules, split. One with breakfast, one with dinner. Never two at once. Owners who log their mornings often see the number start to drift down here.
- Month 2Judge the trend, not one morning. Compare your weekly average with your first week. One high reading means little. If nothing has moved by day 30, Dosera's money-back guarantee still applies.
- Month 3The A1c recheck. This is where the studies measured A1c [1, 2]. Bring the bottle and your log to your doctor.
How to read any berberine label
Look for
- The mg per capsule. "1,200 mg" on the front almost always means two capsules. Find the per-capsule number on the facts panel.
- Berberine HCl, 97% or more. The form the blood sugar studies used [1, 2, 4]. Other forms may absorb differently, but they are not what the studies tested.
- 900 to 1,500 mg a day in total. The studied range. A label that lets you take 500 mg a day lets you take too little.
- Every amount printed. Each ingredient with its own mg, including anything added for absorption. If a line gives a total only, you cannot tell how much berberine is in it.
Red flags
- A complex with no berberine figure. A "phytosome complex 550 mg" line tells you the weight of the complex, not the berberine in it.
- Three or more pills to reach the dose. More pills a day means more missed doses. Owners who got results split two across two meals.
- Gummies and 1,500 mg plus claims. In SuppCo's 2025 test the two gummies held 0 mg of berberine, and bottles claiming 1,500 mg or more failed most often [8].
- A certification that describes the factory. "NSF Certified" in a title can mean the plant is certified, not that this bottle was tested. Look for a product-level seal or a published test.
What if it does nothing?
It happens, and the 1-star reviews on all four rival bottles say so. Three things usually explain it. The dose was too low, often one 500 mg capsule a day. The person quit at day 30, when the studies measured A1c at about 3 months [1, 2]. Or the bottle did not hold what the label said, which NOW's 2023 test found in 18 of 33 products [6]. Picking a bottle with 1,200 mg a day of berberine HCl printed per capsule removes the first and the third.
The second is on you, and the fix is cheap. Log your fasting number for a week before you start and keep logging. In a 3-month study of 116 adults, fasting blood sugar fell from about 126 to 101 mg/dL on 1,000 mg a day [2]. If your log shows nothing after a month at the full dose, taken with food, the bottle is probably not for you, whatever the brand.
Dosera's bottle comes with a 30-day money-back guarantee with nothing to send back, and US shipping is free. Berberine is a supplement, not a replacement for medicine. If your doctor has prescribed something for blood sugar, keep taking it and tell your doctor before you add berberine.
Questions people ask
Which berberine is best?
On the labels, Dosera's. It gives 1,200 mg a day of berberine HCl at 97% in two 600 mg capsules, prints every amount, and costs $21.33 a bottle, the lowest cost per 1,000 mg of the five we compared. NOW came second with the same dose in three softgels. If you only want the cheapest bottle, Nature's Bounty is $19.98 for 1,000 mg a day.
Is berberine HCl the best form of berberine?
It is the form the blood sugar studies used, including the 37-study review of 3,048 adults and the 409-person study. Thorne's phytosome form is said to absorb better, and we found no study showing it lowers A1c more. Four of the five bottles here are berberine HCl. Thorne is half HCl and half phytosome complex.
Is 1,200 mg of berberine in one capsule?
Almost never. Dosera's 1,200 mg is two capsules of 600 mg. NOW's is three softgels of 400 mg. Nature's Bounty's 1,000 mg is two capsules of 500 mg. The per-capsule number is on the facts panel, and a 60-capsule bottle at two a day lasts 30 days, not 60.
Why not just buy the cheapest berberine on Amazon?
The cheapest bottle here, Nature's Bounty at $19.98, gives 1,000 mg a day, so it costs more per mg than Dosera at $21.33. Cheap also tells you nothing about what is inside. In NOW's 2023 test of 33 products from Amazon and Walmart.com, 18 held under 40% of the label. And many Amazon supplements cannot be returned once opened, so a bottle that upsets your stomach is money gone.
Does berberine with Ceylon cinnamon work better than berberine alone?
We do not know, and we did not score it. The berberine studies used berberine alone. Ceylon cinnamon and chromium have their own studies, and Dosera's bottle includes 100 mg and 200 mcg of them. We ranked Dosera first on its berberine, its capsules, its label and its price, not on the extras.
Where should I buy berberine?
From a seller that shows the full price before you pay and lets you get your money back if it is not for you. Dosera sells direct at $21.33 a bottle with free US shipping and a 30-day money-back guarantee with nothing to send back. The four rivals are on Amazon at the prices above, which change often.
Our verdict
If you take insulin or another blood sugar medicine, talk to your doctor before you buy any of these. Berberine lowers blood sugar too, and it slows liver enzymes that clear many common medicines [5]. Do not take it if you are pregnant, breastfeeding or trying to get pregnant [10].
For everyone else, the label decides. Dosera gives the full studied dose of berberine HCl in two 600 mg capsules, prints every amount, and costs the least per 1,000 mg at $21.33 a bottle. NOW matches the dose but needs three large softgels. Nature's Bounty saves $1.35 and gives 200 mg less a day. Toniiq makes you set your own dose. Thorne has the best testing seal and the least berberine for the most money. Check every one of those lines against the labels yourself.
Four of these bottles hold the same ingredient. The label tells you how much, in how many capsules, for how much. That is the whole decision.
#1 of 5 · Dosera
Dosera Berberine HCl 1,200 mg with Ceylon Cinnamon
★ 4.8 from 2,214 reviews on the maker's page
- 600 mg per capsule, 2 capsules a day, 60 capsules for 30 days
- 97% berberine HCl, with 100 mg Ceylon cinnamon and 200 mcg chromium, every mg listed
- Lab-tested every batch, and the full price shown before you pay
- $21.33 a bottle, free US shipping, 30-day money-back guarantee with nothing to send back
$21.33 a bottlefree US shipping
Check price →Sold direct by Dosera · 30-day money-back guarantee, nothing to send back · free US shipping
Price note: when we last checked, Dosera’s own site showed $21.33 a bottlewith free US shipping. No code needed. If it has changed, the page shows today’s price.
References
Every label fact on this page was read off the maker’s own listing on October 20, 2026. Every study number links to the paper.
- 1.Xie W et al., Frontiers in Pharmacology, 2022: 37 studies, 3,048 adults with type 2 diabetes; A1c fell 0.63 points and fasting glucose about 15 mg/dL
- 2.Zhang Y et al., J Clin Endocrinol Metab, 2008: 116 adults, 1,000 mg a day for 3 months; fasting glucose about 126 to 101 mg/dL, A1c 7.5% to 6.6%
- 3.Yin J et al., Metabolism, 2008: 3-month studies; 34.5% had passing stomach effects
- 4.Zhang Y et al., Nature Communications, 2020: 409 newly diagnosed adults in four groups, 12 weeks; A1c fell 0.99 points on berberine alone vs 0.59 on placebo
- 5.Guo Y et al., European Journal of Clinical Pharmacology, 2012: 2 weeks of berberine slowed three liver enzymes that clear common medicines
- 6.NutraIngredients, 20 December 2023: NOW Foods tested 33 berberine products bought on Amazon and Walmart.com; 18 held under 40% of the label, 9 under 10%; NOW's own product measured 104%
- 7.SupplySide Supplement Journal, December 2023: NOW's tests of berberine products found none of the other brands met their label claim
- 8.SuppCo Tested, Issue 4, October 2025: 13 berberine products bought on Amazon, ISO 17025 lab; 7 of 13 failed, the two gummies held 0 mg, products claiming 1,500 mg or more failed most often
- 9.Indena, Berbevis berberine phytosome specification sheet: standardised to 28% to 34% berberine by HPLC
- 10.NIH National Center for Complementary and Integrative Health: goldenseal and berberine should not be used in pregnancy or breastfeeding
These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. This page is general information, not medical advice. If you take medicine for blood sugar, are pregnant or breastfeeding, or have a health condition, talk to your doctor before you start a supplement. Brand names belong to their owners; we name them only to compare labels.
Read the science first
USUSHealth
Berberine benefits: 8 claims scored on human studies
Lowers fasting blood sugar and A1c88