By Team OneStopSupplements.org | Reviewed October 30, 2026 | Affiliate disclosure: Insulin Herb is sold through Digistore24. If you buy through our links we may earn a commission at no extra cost to you. It doesn’t change our verdict.
Our verdict: 3 out of 5
Insulin Herb is a plain berberine capsule, and that’s mostly in its favour. Unlike the blends we’ve reviewed, it tells you the dose (500 mg of berberine per capsule), the price is easy to work out, and there’s no subscription. What holds it back is the marketing: bold claims, no reference list, no named manufacturer and a guarantee that’s hard to pin down.
Best for: adults who specifically want to try berberine, have checked with a doctor or pharmacist, and are prepared to take it for a few months before judging it.
Not for: anyone taking metformin, insulin or other glucose-lowering medicine who hasn’t had it cleared first, anyone pregnant or nursing, and anyone hoping to replace treatment.
If you try it: the 3-bottle pack is the sensible trial size. Check the current Insulin Herb offer.
How we reviewed it
We read the Insulin Herb sales page from top to bottom: the ingredients, dose, claims, prices, shipping, guarantee, testimonials and the studies it mentions. We then checked the main ingredient against independent research. We haven’t bought or taken the product, so this is an analysis of what the company tells you and how well it holds up, not a report on how it feels. Prices and terms were checked on the date above and can change.
What Insulin Herb is
Insulin Herb is a berberine supplement from a brand called Ezyabsorb. Each capsule has 500 mg of berberine, which the page says comes from the bark of the Phellodendron amurense tree, plus milk thistle (silymarin). A bottle holds 60 capsules. The page says the capsules can also be opened and mixed into a smoothie or tea.
The company positions it as a way to support blood sugar and cholesterol and to help with belly fat. The “Ayurvedic miracle plant” label on the page is marketing. Berberine is used in traditional Chinese and Ayurvedic medicine, but the capsule is a modern supplement.
What’s in it
Berberine (500 mg per capsule)
This is the whole point of the product, and the page deserves credit for stating the amount. Berberine is a plant compound that has been studied in people with type 2 diabetes. A 2019 review in Endocrine Journal pooled 28 randomised trials with 2,313 patients and found lower fasting glucose, post-meal glucose and A1C in people taking berberine than in comparison groups.
The caveats are real. All 28 trials were in China. Most were rated low to moderate quality. The results varied a lot between trials, and the authors flagged possible publication bias for the A1C result. The review discusses doses around 1.5 to 2 grams a day. The Insulin Herb label recommends 1,000 to 1,500 mg a day, which is toward the lower end of that range. The U.S. National Center for Complementary and Integrative Health sums up berberine, chromium and cinnamon together: the research isn’t strong enough for firm conclusions.
Milk thistle (silymarin)
Listed as a second ingredient with no amount. The page says milk thistle helps berberine absorb, and cites a study without naming it. We couldn’t verify that, so treat it as a claim, not a fact.
What’s missing
There’s no full supplement facts panel on the page, no list of other ingredients (capsule shell, fillers) and no named manufacturer. You can’t see exactly what else is in the capsule.
What the sales page claims, and what to make of it
- “Confirmed by multiple human studies.” There are human studies of berberine in general, as above. None is cited on the page, and none tests this product. The page says to “follow the links at the bottom,” but the links aren’t there.
- The weight-loss study. The page cites a 12-week study showing about 2.3% weight loss (roughly 5 pounds) at 3,500 mg a day. That’s more than double the dose on this label, so it can’t tell you what Insulin Herb will do at 1,000 to 1,500 mg.
- “Not known to have any major side effects” and “heal without side effects.” That’s too rosy. The berberine review mentions that a small share of people report stomach problems such as vomiting, diarrhoea or constipation. Many people on berberine report an upset stomach in the first weeks, and starting at a low dose and taking it with food are common ways to reduce that.
- “Removes deep body fat around the belly and organs” and “naturally lowers your blood sugar.” These are strong statements for a supplement and aren’t backed by anything on the page.
- “Can be taken on top of metformin.” More on this below. It’s not a casual statement.
- Mixed signals in the small print. One footer says the product isn’t intended to diagnose, treat, cure or prevent any disease and hasn’t been evaluated by the FDA. Another says the information is “for entertainment purposes only.” Headings elsewhere use words like “heal.” Read the disclaimers, not the headlines.
- Testimonials include people describing A1C changes and stopping metformin. Those are individual stories that can’t be verified, and the page itself says results aren’t typical. No doctor endorsement is shown.
Price and what you actually pay
The page lists two options: one bottle for $39.90, or a 3-bottle value pack for $99.90 ($33.30 a bottle, a 16% saving). Shipping is free on all orders in the US, and orders of three or more bottles get free expedited shipping. It’s a one-time purchase, and the page says there’s no recurring billing or automatic refill. It notes that PayPal may show a “billing agreement” message that the company says it can’t change.
The cost per day depends on how many capsules you take, and the page isn’t consistent. It says “1 capsule 2 to 3 times a day” in one place and “2 capsules per day” in another. Here is what it works out to:
| Pack | Price | At 2 capsules a day | At 3 capsules a day |
|---|---|---|---|
| 1 bottle (60 capsules) | $39.90 | 30 days, about $1.33 a day | 20 days, $2.00 a day |
| 3 bottles (180 capsules) | $99.90 | 90 days, about $1.11 a day | 60 days, about $1.67 a day |
Even at three capsules a day, the 3-bottle pack comes out cheaper per day than the Gluco6 and Gluco Extend packs we’ve reviewed, and you know the berberine dose. The page also says “less than $30 a month,” which doesn’t match either price shown. Ignore that line.
The guarantee
The page advertises a “100% money-back guarantee” and a “90-day, empty bottle guarantee.” That wording is the weakest part of the offer.
- “Empty bottle” suggests you’re expected to use the product before asking for a refund. That actually fits berberine, which the page says can take 4 to 12 weeks to show an effect.
- Another section says to “send it back to us” for a full refund, which sounds like you return something. The page doesn’t say what, and gives no return address, contact email or details on who pays return shipping.
- The page says it’ll “make it right for you” if you’re unhappy. That’s a promise, not a policy.
Before ordering, find the contact details on the company’s Contact Us or Shipping and Returns page, and ask them in writing exactly what you’d need to do to get a refund. Save the reply. Set a reminder for day 75.
Safety: the part to take seriously
Berberine is an active ingredient, and it behaves more like a drug than a food.
- If you take metformin, insulin or any glucose-lowering tablet, talk to your doctor before starting. In the review above, berberine taken with diabetes tablets lowered fasting and post-meal glucose more than the tablets alone. That might be useful under supervision, but at home it can push your blood sugar lower than your doctor planned. The page says it “can be taken on top of metformin,” and gives no interaction information at all.
- Do not stop or reduce your medication because of a testimonial or a supplement. Any change should come from your doctor.
- If you’re pregnant or nursing, check with your doctor first. The company’s own page says to consult a physician in that case.
- Expect possible stomach upset, especially early on. Tell your doctor if it persists.
- Tell your healthcare team about every supplement you use.
Pros and cons
| Pros | Cons |
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How it compares with Gluco6 and Gluco Extend
Both Gluco6 and Gluco Extend are multi-ingredient blends that don’t show doses. Insulin Herb is the opposite: one main ingredient, a stated dose and a lower price per day. If you want to try berberine specifically, it’s the more transparent of the three. If you’d rather have a blend, those two are your options, with the same caveats about missing amounts. None of the three has a published study of the finished product.
For the basics that matter more than any capsule, read our complete guide to blood sugar and diabetes.
Final verdict
Insulin Herb earns 3 out of 5. It’s honest about the one thing that matters most, the berberine dose, and it’s reasonably priced. But a supplement that’s easy to understand is still held back by a sales page that overreaches, a missing reference list, no named manufacturer and a vague guarantee.
If you decide to try it, speak to your doctor first, start with the 3-bottle pack, take it with food, get the refund terms in writing and note the day-75 deadline. See the current Insulin Herb offer.
Frequently asked questions
What is Insulin Herb?
A berberine capsule from the brand Ezyabsorb, with 500 mg of berberine per capsule plus milk thistle. Each bottle holds 60 capsules.
Does berberine lower blood sugar?
Trials in people with type 2 diabetes, mostly in China, have found lower glucose and A1C with berberine, though most were of low to moderate quality. The evidence is promising but not firm.
How do you take it?
The page says one capsule two or three times a day, before or after a meal, for a total of 1,000 to 1,500 mg a day. It also says “2 capsules per day” elsewhere, so check the label on your bottle.
Can I take it with metformin?
Only with your doctor’s agreement. The page says it can be taken on top of metformin, but berberine can add to the glucose-lowering effect of diabetes medication, so your doctor may need to monitor you.
How much does it cost?
At the time of writing, $39.90 for one bottle or $99.90 for three, with free shipping. It’s a one-time purchase.
Is there a guarantee?
The page offers a 90-day “empty bottle” money-back guarantee, but gives no return address or clear process. Ask the company to confirm the steps in writing before you buy.
What are the side effects?
Some people get an upset stomach, with symptoms such as diarrhoea, constipation or vomiting. Talk to your doctor if it doesn’t settle.
Sources
- Insulin Herb sales page, checked October 30, 2026 (source of all claims, prices and terms quoted above).
- Liang et al., 2019, Endocrine Journal: Effects of berberine on blood glucose in patients with type 2 diabetes mellitus, a systematic literature review and a meta-analysis
- NCCIH: 6 things to know about type 2 diabetes and dietary supplements
