Ingredient research
Berberine: What the Research Shows, and Why It Is Missing From the GlucoZen Label
NCCIH says berberine has a modest effect on blood glucose in type 2 diabetes, but the evidence is limited and mostly from 46 studies in Chinese patients. It can change how some drugs are processed and is not for pregnancy, nursing or infants. GlucoZen marketing names berberine HCl, yet the bottle label does not list it.
Written by the Myglucozen editorial teamUpdated · 8 min read
The basics
What is berberine, and why do GlucoZen buyers hear about it?
Berberine is a compound found in several plants and sold as a supplement. It shows up in GlucoZen marketing as "berberine HCl," right next to Okinawa honey, cinnamon bark and turmeric.
So two questions matter. What does the research really say? And is berberine actually in the bottle?
The short version: the research is modest and limited, the drug cautions are real, and the GlucoZen bottle label does not list berberine at all. The rest of the article explains each point with its source.
Label check
Is berberine on the GlucoZen bottle label?
No. The Supplement Facts panel lists 0.7 mcg of chromium and a 200 mg proprietary blend of 22 ingredients per 1 mL. Maca comes first and L-carnitine last. Berberine is not among them.
Tap a number to see what that part of the label says. On a phone, swipe the label sideways.
- Directions
Adults, take 1 mL (approximately 2 droppers full) twice daily or as directed by a healthcare professional.
- Caution and warning
Do not exceed the dose. Not for anyone under 18, or pregnant or nursing mothers. Ask a physician first if you take medication or have a medical condition.
- Children, seal, storage
Keep out of reach of children. Do not use if the safety seal is damaged or missing. Store in a cool, dry place.
- FDA statement
Not evaluated by the FDA. Not intended to diagnose, treat, cure or prevent any disease.
- Distributor
GlucoZen, 19655 E 35th Dr #100, Aurora, CO 80011. The phone line literally reads "Phone Number": no number is printed.
- Front panel
GlucoZen, Blood Sugar Support, with a blue shield logo. "Support" wording, not a treatment claim.
- Bottle size
2 fl oz (59.14 mL), dietary supplement. At 1 mL twice a day, one bottle lasts 30 days.
- Serving size
1 mL per serving, 60 servings per container.
- Chromium
0.7 mcg per serving (2% of the Daily Value), as chromium picolinate.
- Proprietary blend
200 mg per mL of 22 ingredients in weight order: maca first, L-carnitine last. No single amounts.
- Other ingredients
Deionized water, organic citrus extract, natural flavors, stevia and xylitol (keep away from dogs).
- Side code
KD_000_1_MMDDYY, printed sideways. A template-style version code, not a lot number.
Marketing art can change at any time. If it and the Supplement Facts disagree, go by the bottle you receive. Our label versus marketing guide covers every difference.
NCCIH
What does NCCIH say about berberine and blood glucose?
NCCIH, part of the National Institutes of Health, says berberine has a "modest effect on lowering blood glucose levels in people with type 2 diabetes" (NCCIH: In the News - Berberine). In the same breath, it calls the evidence limited.
Its diabetes and supplements guide adds detail. The berberine research it counts covers 46 studies with 4,158 people, mostly Chinese patients (NCCIH: Diabetes and dietary supplements).
NCCIH's broader warning matters most. It says it is very important not to replace medical treatment for diabetes with an unproven health product (NCCIH: Diabetes and dietary supplements). A modest effect in research is not the same as a treatment you can rely on.
Memorial Sloan Kettering
How does Memorial Sloan Kettering rate the berberine evidence?
Memorial Sloan Kettering Cancer Center's About Herbs database rates it as limited and lower quality. It says that evidence suggests berberine may lower blood sugar (MSKCC: Berberine). Its page was updated June 12, 2023.
"Lower quality" does not mean the findings are false. It means we cannot be confident they will hold up in larger, better trials.
So two respected sources agree: a modest signal, built on studies too weak to call berberine proven.
At a glance
What do the main sources agree on about berberine?
All four sources below are public and free to read. None of them recommends berberine as a diabetes treatment.
| Source | On blood glucose | On safety |
|---|---|---|
| NCCIH, In the News (NCCIH: In the News - Berberine) | Modest effect in type 2 diabetes; limited evidence | Might interact with medicines; not in pregnancy, nursing or for infants |
| NCCIH, diabetes guide (NCCIH: Diabetes and dietary supplements) | 46 studies, 4,158 people, mostly Chinese patients | Never replace diabetes treatment with an unproven product |
| Memorial Sloan Kettering (MSKCC: Berberine) | Limited, lower-quality evidence that it may lower blood sugar | Raised cyclosporine and tacrolimus levels; slowed three CYP enzymes; may affect sulfonylureas |
| ADA Standards of Care 2026 (ADA Standards of Care 2026, Sec. 5) | Insufficient evidence for routine herbal supplement use | No berberine-specific safety guidance |
| GlucoZen bottle label | Berberine not listed | Label caution: ask a physician first if you take medication |
Try GlucoZen for 60 days1 mL twice a day · 30 days per bottle · price shown at secure checkout
Order nowInteractions
Which medicines can berberine interact with?
Berberine can change how the body handles some prescription drugs. NCCIH says simply that it might interact with medicines (NCCIH: In the News - Berberine). Memorial Sloan Kettering names specific ones (MSKCC: Berberine).
- Transplant drugs. In transplant patients, berberine raised blood levels of cyclosporine and tacrolimus.
- Liver enzymes. It reduced the activity of CYP2D6, CYP2C9 and CYP3A4. These enzymes break down many common medicines, so slowing them can push drug levels up.
- Sulfonylureas. Berberine may affect this group of diabetes pills.
If you take any prescription, especially transplant drugs or diabetes medicine, ask before you try a berberine product.
Our medicines and GlucoZen guide covers interactions for the ingredients that are on the label.
Who should avoid it
Who should not take berberine?
Both sources say pregnant and breastfeeding women should avoid berberine (NCCIH: In the News - Berberine) (MSKCC: Berberine). NCCIH adds that it should never be given to infants. In newborns it can worsen jaundice and lead to kernicterus, a type of brain damage (NCCIH: In the News - Berberine).
- Pregnant? Skip berberine products.
- Nursing? Skip them too.
- Taking transplant or diabetes drugs? Ask your care team first.
The GlucoZen label has its own limits: not for anyone under 18, or for pregnant or nursing mothers.
ADA
What does the American Diabetes Association say about herbal supplements?
The ADA's 2026 Standards of Care find insufficient evidence to support routine use of herbal supplements to improve blood sugar (ADA Standards of Care 2026, Sec. 5).
Food, activity, sleep and prescribed care remain the tools with the strongest evidence.
For buyers
What should GlucoZen buyers do with the berberine research?
Start with the label. If berberine is the reason you want GlucoZen, know that the bottle does not list it.
Read the Supplement Facts
Check the panel on the bottle you receive. Our Supplement Facts guide explains each line.
Ask about your medicines
Whether you choose berberine or GlucoZen, bring the label and your medicine list to your pharmacist.
Use the guarantee window if it is not right
The sales page offers 60 days from the ship date. Contact order support at +1 (323) 475-1425 before you return anything.
Want the bigger picture on supplements sold for blood sugar? The guide to choosing a blood sugar supplement lists the questions worth asking before you buy any product.
FAQ
Berberine and GlucoZen FAQ
Does GlucoZen contain berberine?
Not according to the bottle label. The Supplement Facts list 0.7 mcg of chromium and a 200 mg blend of 22 ingredients per 1 mL, and berberine is not one of them. It appears only in brand marketing, such as the Inside GlucoZen graphic.
Does berberine lower blood sugar?
NCCIH says berberine has a modest effect on blood glucose in people with type 2 diabetes, but the evidence is limited. Memorial Sloan Kettering calls the evidence lower quality. Neither source treats berberine as a proven diabetes treatment.
Is berberine safe to take with diabetes medication?
Ask your doctor first. Memorial Sloan Kettering says berberine may affect sulfonylureas and slows liver enzymes that break down many drugs. NCCIH says it might interact with medicines. Never change prescribed diabetes medicine on your own.
How many studies have tested berberine for diabetes?
NCCIH counts 46 studies with 4,158 people, mostly Chinese patients. The overall finding is a modest effect on blood glucose in type 2 diabetes, with limited evidence. Memorial Sloan Kettering rates the evidence as lower quality.
Who should not take berberine?
Pregnant and breastfeeding women should avoid it, per NCCIH and Memorial Sloan Kettering. It should never be given to infants, because it can worsen newborn jaundice. People on cyclosporine or tacrolimus should ask their transplant team first.
Why is berberine in GlucoZen ads but not on the label?
We do not know. The brand info page and graphic list berberine HCl and a once-daily, five-drop dose. The bottle lists a different formula at 1 mL twice daily. Go by the Supplement Facts on the bottle you receive.
Who wrote this
Written and reviewed by
A small team that reads the bottle label line by line, checks every number against public health sources (NIH, NCCIH, NIDDK, CDC, ADA, FDA, FTC) and rewrites it in plain English. We do not write for the manufacturer, and we update a page whenever the label, the prices or the evidence changes.
Last updated . See our editorial standards and how we check reviews. This website is run by a U.S. stocking partner, not by the manufacturer. We earn a commission when you order through our links.
Keep reading
More about GlucoZen
Label vs marketing
Why the GlucoZen bottle and the brand marketing list different ingredients and doses, and which one to follow.
Read more
Medicines and GlucoZen
A medicine-by-medicine check of GlucoZen's blend, with the questions worth asking your pharmacist.
Read more
Supplement Facts
The whole GlucoZen label, panel by panel: serving size, chromium, the 200 mg blend and the fine print.
Read moreU.S. stocking partner for GlucoZen
Ready to try GlucoZen?
Pick a pack. Every pack lasts at least 60 days at the label dose, the whole money-back window.
- Secure checkout
- 60-day money-back guarantee
- Ships from the U.S.