Ingredient profile
Green Tea Extract in GlucoZen: How Much Is There and What to Watch
Green tea leaf extract is 7th of the 22 ingredients in the GlucoZen blend. That caps it at about 29 mg per 1 mL, or about 57 mg a day at the label dose. It brings catechins and some caffeine, but the label gives no caffeine figure. Concentrated green tea extract is a well-established, rare cause of liver injury (LiverTox: Green tea).
Written by the Myglucozen editorial teamUpdated
The basics
What is green tea extract?
Green tea extract is a concentrate made from the leaves of Camellia sinensis, the same plant used for everyday green tea. GlucoZen lists it as "Green Tea (Camellia sinensis) Leaf Extract" inside its proprietary blend.
The leaf is a source of catechins and of caffeine (NCCIH: Green tea). An extract concentrates the leaf, and that matters for safety.
| Label name | Green Tea (Camellia sinensis) Leaf Extract |
|---|---|
| What it is | Camellia sinensis, leaf extract |
| Position on the label | 7 of 22 in the blend |
| Per 1 mL serving | At most about 29 mg (57 mg a day at 2 servings) |
| Amount used in research | Extract doses vary; liver reports are mostly with concentrated extract pills |
| Strength of evidence | Mixed |
| Main use studied | Source of catechins and some caffeine |
| Main caution | Concentrated green tea extract is a known, rare cause of liver injury; contains caffeine. |
Label position
Where does green tea sit on the GlucoZen label?
Green tea extract is the 7th ingredient in a 200 mg blend of 22. The label lists the blend from heaviest to lightest, as federal rules require. It does not print single amounts (FDA Labeling Guide Ch. IV: proprietary blends).
Maca, grape seed, guarana, African mango, eleuthero and astragalus come before it. Gymnema follows.
Every line is explained in our Supplement Facts guide.
Blend math
How much green tea extract is in each serving?
At most about 29 mg per 1 mL. The real amount is likely lower.
The ceiling comes from simple division. The 7th ingredient in a list ordered by weight can weigh at most one seventh of the total. One seventh of 200 mg is about 29 mg. At 1 mL twice a day, the best case is about 57 mg of extract daily.
- 200 mg
The whole proprietary blend in 1 mL. The label lists 22 ingredients, heaviest first, with no single amounts (FDA Labeling Guide Ch. IV: proprietary blends).
- about 9 mg
The average share if all 22 weighed the same: 200 divided by 22. Most real blends are uneven, so the first few are larger.
- 200 / k
The k-th ingredient can weigh at most 200 divided by k. Maca, 1st, can be up to 200 mg; gymnema, 8th, at most 25 mg; L-carnitine, 22nd, at most about 9 mg.
The most each ingredient can weigh in one 1 mL serving
- Maca≤ 200 mg
- Grape seed≤ 100 mg
- Guarana≤ 67 mg
- African mango≤ 50 mg
- Eleuthero≤ 40 mg
- Astragalus≤ 33 mg
- Green tea≤ 29 mg
- Gymnema≤ 25 mg
- Asian ginseng≤ 17 mg
- L-carnitine (22nd)≤ 9 mg
Best case, worked out from label order alone. Two servings a day doubles each figure. Chromium is separate: 0.7 mcg per serving (NIH ODS: Chromium fact sheet).
What studies found
What does research say about green tea extract?
Most of what health agencies publish on green tea extract is about safety. LiverTox, the NIH liver injury database, gives it the top likelihood score, A (LiverTox: Green tea). That means a well-established cause of liver injury.
- LiverTox counts more than 100 published cases of liver injury tied to green tea extract. Some people needed a liver transplant (LiverTox: Green tea).
- The injury usually showed up 1 to 6 months after a person started taking the extract (LiverTox: Green tea).
- Drinking green tea as a beverage has not been linked to liver injury (LiverTox: Green tea).
- NCCIH says the reported cases are mainly with green tea extract pills (NCCIH: Green tea).
- People who carry a certain gene variant, found in about 5 to 15 percent of Americans, appear more likely to have this reaction (NCCIH: Green tea).
We make no blood sugar claim for green tea, because our sources do not support one.
Caffeine
Does the green tea in GlucoZen add caffeine?
Yes, some. Green tea contains caffeine (NCCIH: Green tea), and so does guarana, which sits 3rd in the same blend (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)). The label states no caffeine total for either one.
For healthy adults, the FDA cites 400 mg of caffeine a day as an amount not generally tied to negative effects (FDA: How much caffeine is too much). Even added together, the extract ceilings below stay far under that mark. Only part of each extract is caffeine.
| Ingredient | Label position | Extract per 1 mL (at most) | Extract per day (at most) | Caffeine stated? |
|---|---|---|---|---|
| Guarana seed extract | 3 of 22 | About 67 mg | About 133 mg | Not published |
| Green tea leaf extract | 7 of 22 | About 29 mg | About 57 mg | Not published |
| Both, added together | - | About 96 mg | About 191 mg | Not published |
The combined row adds two ceilings, so it overstates the real total. Coffee, tea and soda count toward your daily caffeine too.
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Green tea drink vs extract pills vs GlucoZen drops
The same leaf acts differently in different forms. Liver reports cluster around extract pills, not tea you drink (LiverTox: Green tea). GlucoZen sits in between: an extract, but a small, capped amount in a liquid.
| Form | What it is | Amount | Liver reports | Caffeine |
|---|---|---|---|---|
| Brewed green tea | Leaves steeped in water | Varies by cup | Not linked to liver injury | Yes |
| Green tea extract pills | Concentrated leaf extract | Varies by brand | Well-established cause, more than 100 cases | Yes |
| GlucoZen drops | Leaf extract, 7th in a 22-part blend | At most about 29 mg per 1 mL | No GlucoZen-specific data published | Yes, amount not stated |
No one has published a safety study of GlucoZen itself.
Cautions
Who should be careful with green tea extract?
Two groups should ask a doctor or pharmacist before using any green tea extract product.
Anyone with past liver trouble should ask a doctor first, because extract-related liver injury is documented (LiverTox: Green tea).
High doses of green tea can lower blood levels of nadolol, a beta-blocker for blood pressure and heart conditions (NCCIH: Green tea). Ask your pharmacist whether a small extract dose matters for you.
The full list of label cautions, including the age and pregnancy limits, lives on the GlucoZen side effects page.
Bottom line
Is the green tea in GlucoZen worth paying attention to?
It is worth knowing about, mostly for safety and caffeine. As a blood sugar ingredient, it has no support we can point to. The amount is also small.
What works in its favor
- A familiar plant many people already drink
- Named clearly on the label, with its Latin name
- Capped at about 29 mg per serving by label order
What to keep in mind
- Exact amount and caffeine content are not printed
- The extract form carries a known, if rare, liver risk
- No GlucoZen trial tests the green tea, or the formula
To see how green tea fits with the other 21 blend ingredients, browse every GlucoZen ingredient.
FAQ
Green tea extract in GlucoZen: common questions
How much green tea extract is in GlucoZen?
The label does not say. Green tea is 7th of 22 ingredients in a 200 mg blend, so it can weigh at most about 29 mg per 1 mL. At the label dose of 1 mL twice a day, that is no more than about 57 mg of extract daily, and likely less.
Does GlucoZen have caffeine from green tea?
Yes. Green tea contains caffeine, and GlucoZen also contains guarana, another caffeine source. The label does not state how much caffeine either one adds. Their combined extract ceiling is far below the 400 mg of caffeine a day that the FDA cites for healthy adults.
Can green tea extract hurt your liver?
In rare cases, yes. LiverTox rates green tea extract a well-established cause of liver injury, with more than 100 published cases, usually 1 to 6 months after starting. Drinking green tea as a beverage has not been linked to liver injury. Ask a doctor first if you have had liver problems.
Is green tea extract the same as drinking green tea?
No. Both come from Camellia sinensis leaves, but an extract concentrates the leaf. Liver injury reports involve extract products, mainly pills, while green tea as a drink has not been linked to them. GlucoZen uses a leaf extract in liquid drops, in a small, unstated amount.
Does green tea extract interact with any medicines?
NCCIH notes that high doses of green tea can lower blood levels of nadolol, a beta-blocker. If you take nadolol or any heart or blood pressure medicine, ask your pharmacist before adding GlucoZen. Bring the bottle so they can read the full ingredient list.
Why is green tea in a blood sugar support supplement?
The brand does not explain each ingredient choice on the label. We do not make a blood sugar claim for green tea, because our sources do not support one. GlucoZen is a dietary supplement, not a treatment for diabetes, and no trial of the full formula is published.
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.
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