Ingredient profile
Guarana in GlucoZen: A Hidden Caffeine Source, in Plain Numbers
Guarana seed extract is the third of 22 ingredients in GlucoZen's 200 mg blend, so it can weigh at most about 67 mg per 1 mL. Guarana is a natural caffeine source (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)), but the label does not state how much caffeine each serving holds. The FDA cites 400 mg of caffeine a day as generally safe for healthy adults (FDA: How much caffeine is too much).
Written by the Myglucozen editorial teamUpdated
The basics
What is guarana, and why does it matter in GlucoZen?
Guarana (Paullinia cupana) is a plant whose seeds contain caffeine. The NIH lists it as a caffeine source in supplements (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)).
In GlucoZen, guarana seed extract sits third in the proprietary blend, after maca and grape seed. That rank makes it one of the heavier ingredients, which is why its caffeine deserves a close look.
| Label name | Guarana (Paullinia cupana) Seed Extract |
|---|---|
| What it is | Paullinia cupana, seed extract (caffeine source) |
| Position on the label | 3 of 22 in the blend |
| Per 1 mL serving | At most about 67 mg of extract (caffeine not stated) |
| Amount used in research | Used as a caffeine source; FDA: up to 400 mg caffeine a day for healthy adults |
| Strength of evidence | Caffeine effects only |
| Main use studied | Natural source of caffeine |
| Main caution | Adds caffeine to coffee and tea; the label does not say how much. |
Blend math
How much caffeine is in GlucoZen?
The label does not say. It lists guarana by name and rank but prints neither the extract amount nor its caffeine content.
What we can work out is a ceiling for the extract itself. As the third ingredient, guarana can weigh at most 200 divided by 3, or about 67 mg per 1 mL (FDA Labeling Guide Ch. IV: proprietary blends). Extract weight is not caffeine weight: only part of any guarana extract is caffeine.
- 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).
At 1 mL twice daily, guarana extract tops out near 133 mg a day. The caffeine inside that extract must be lower still.
Side by side
GlucoZen's guarana vs. FDA caffeine benchmarks
Even the worst case sits well under the FDA's daily figure. If every milligram of guarana extract were pure caffeine, which it is not, 133 mg a day would be about a third of 400 mg.
| Item | Amount | What it means |
|---|---|---|
| Guarana extract, one 1 mL serving | At most about 67 mg | Extract weight; caffeine share not stated |
| Guarana extract, two servings | At most about 133 mg | Best case at the label dose |
| Caffeine printed on the label | Not published | Ask support for the figure |
| FDA daily caffeine figure | 400 mg | Not generally linked to negative effects in healthy adults |
| Coffee equal to 400 mg | About 2-3 cups (12 oz each) | FDA's own comparison |
| Rapid intake linked to toxic effects | About 1,200 mg | Can cause effects such as seizures |
The real question is not GlucoZen alone. It is GlucoZen plus your coffee, tea, soda and any other supplement.
The evidence
What does research say about guarana for blood sugar?
Our sources describe guarana only as a caffeine source. The NIH weight-loss fact sheet covers it in that role and gives no blood sugar finding for it (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)).
So its effects are, as far as the evidence on file goes, caffeine effects. There is no trial in our sources of guarana for glucose, HbA1c or insulin.
The American Diabetes Association finds insufficient evidence to support routine use of herbal supplements to improve blood sugar (ADA Standards of Care 2026, Sec. 5). Guarana falls under that heading.
Count it up
Does GlucoZen have other sources of caffeine?
Yes, one more. Green tea leaf extract, seventh in the blend, also contains caffeine (NCCIH: Green tea). Neither amount is printed. Read more on green tea in GlucoZen.
List your usual caffeine
Write down coffee, tea, energy drinks, soda and pre-workout products for a normal day.
Add GlucoZen as an unknown
Mark two servings a day as "some caffeine, amount not stated." Ask [email protected] if you want a number.
Stay well under 400 mg
The FDA figure is for healthy adults (FDA: How much caffeine is too much). If you have a health condition, ask your doctor what limit fits you.
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Order nowSafety
Who should be careful with the guarana in GlucoZen?
Anyone who limits caffeine should treat GlucoZen as a caffeinated product. The 400 mg figure applies to healthy adults, not to everyone (FDA: How much caffeine is too much).
The label says do not exceed the recommended dose of 1 mL twice daily. Extra servings mean extra guarana and green tea, with no printed caffeine total.
- The label says GlucoZen is not for anyone under 18, or for pregnant or nursing mothers.
- If you take a medication or have a medical condition, the label asks you to consult a physician first. See GlucoZen side effects for the full formula.
Plain answer
Is the guarana in GlucoZen a lot of caffeine?
Probably not, by the math. The extract cannot top 133 mg a day, and its caffeine is only part of that.
But "probably" is the honest word, because the label leaves the caffeine number out.
Daily use
How should caffeine-sensitive people plan their GlucoZen servings?
The label says only "twice daily" and sets no times. That leaves room to plan around your own caffeine habits.
Keep a simple log for the first two weeks: when you take each 1 mL, your other caffeine, and anything you notice. Share it with your doctor if something feels off.
For dosing basics, see how to use GlucoZen.
FAQ
Guarana and caffeine in GlucoZen: common questions
Does GlucoZen contain caffeine?
Yes. GlucoZen's blend includes guarana seed extract, a natural caffeine source (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)), and green tea leaf extract, which also contains caffeine (NCCIH: Green tea). The label does not print a caffeine amount, so count GlucoZen as a caffeinated product when you add up your daily coffee, tea and soda.
How much guarana is in GlucoZen?
The exact amount is not printed. Guarana is third in a 200 mg blend of 22 ingredients, so it can weigh at most about 67 mg per 1 mL serving. At the label dose of 1 mL twice daily, that ceiling is about 133 mg of guarana extract a day.
Can I drink coffee while taking GlucoZen?
Many healthy adults can, as long as total caffeine stays well under the FDA's 400 mg daily figure, about 2-3 twelve-ounce cups of coffee (FDA: How much caffeine is too much). GlucoZen adds an unstated amount from guarana and green tea. If you have a health condition, ask your doctor first.
Is guarana stronger than coffee?
Our sources do not compare guarana with coffee cup for cup, and GlucoZen does not state its caffeine content. What we can say is that GlucoZen's guarana extract tops out near 67 mg per serving, and only part of that extract weight is caffeine.
Does guarana help blood sugar?
There is no trial in our sources showing that guarana helps blood sugar. The NIH covers guarana only as a caffeine source (NIH ODS: Weight-loss supplements (guarana/caffeine, capsaicin, L-carnitine)). The American Diabetes Association finds insufficient evidence for routine use of herbal supplements to improve blood sugar (ADA Standards of Care 2026, Sec. 5).
How much caffeine is too much in one day?
The FDA says 400 mg a day is an amount not generally linked to negative effects in healthy adults. Rapid intake of about 1,200 mg can cause toxic effects such as seizures (FDA: How much caffeine is too much). People with health conditions may need a lower limit set by their doctor.
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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