Ingredient profile
Guarana and Caffeine in GlucoZen: An Unprinted Amount
Yes, GlucoZen contains caffeine, but the label does not say how much. Guarana seed extract is third of 22 in the 200 mg blend, at most about 67 mg of extract per 1 mL, and green tea leaf extract adds more. Most of guarana's effects come from caffeine. FDA says 400 mg of caffeine a day is not generally linked to negative effects in most adults.
Written by the GlucoZen editorial teamUpdated
The short answer
How much caffeine is in GlucoZen?
The label does not print a caffeine amount. Two blend ingredients carry caffeine: guarana seed extract, third in the list, and green tea leaf extract, seventh (MSKCC, Guarana) (NCCIH, Green tea).
The list order gives an outer limit for each extract. Guarana can weigh at most about 67 mg per serving and green tea at most about 29 mg. The caffeine inside each extract is only part of that weight, and the label does not say how big a part. That is our math from the label, not a lab test.
| Item | Per 1 mL | Per day (2 mL) | Caffeine printed? |
|---|---|---|---|
| Guarana seed extract (3 of 22) | At most about 67 mg of extract | At most about 133 mg of extract | Not published |
| Green tea leaf extract (7 of 22) | At most about 29 mg of extract | At most about 57 mg of extract | Not published |
| FDA figure for most adults | Not applicable | 400 mg of caffeine | About 2 to 3 cups of coffee |
Even at their ceilings, both extracts together weigh less than half of FDA's 400 mg daily figure. That is a weight limit, not a promise of safety, since caffeine sensitivity varies widely (FDA, Caffeine).
On the label
Where is guarana on the GlucoZen label?
Third line of the blend. Tap number 5 for the caffeine sources.
- Serving size
1 mL per serving, 60 servings per 2 fl oz bottle. At 1 mL twice daily, a bottle lasts 30 days.
- Chromium 0.7 mcg
The only printed amount: 0.7 mcg, 2% of the Daily Value. Twice daily is 1.4 mcg, about 4%.
- One 200 mg blend
Twenty-two ingredients share 200 mg, about 9 mg each on average. No single amounts are printed.
- Listed heaviest first
Maca, grape seed and guarana come first, so they are the largest shares of the blend.
- Caffeine sources
Guarana and green tea both contain caffeine. The caffeine amount is not printed.
- Gymnema
The herb most tied to blood sugar claims. Eighth in the list: at most 25 mg per serving.
- Ginseng and peppers
Bird pepper (capsicum), grapefruit seed and Asian ginseng, each a small share.
- Amino acids
Eight amino acids close the list: the smallest shares of the blend.
- Licorice compound
Monoammonium glycyrrhizinate, a licorice-derived sweetener with a blood pressure caution.
- Other ingredients
Water, organic citrus extract, natural flavors, stevia and xylitol. Xylitol is dangerous to dogs.
Guarana follows maca root and grape seed, so it is likely one of the larger shares of the blend. Every line of the panel is typed out on the Supplement Facts page.
The plant
What is guarana and why is it in GlucoZen?
Guarana is the seed of Paullinia cupana, a climbing plant. Its seeds contain caffeine and related compounds, and many of guarana's effects are put down to that caffeine (MSKCC, Guarana).
In blood sugar formulas, guarana usually plays an energy and metabolism role. That is the marketing angle, not a finding about GlucoZen. Guarana is a caffeine source, not a recognized blood sugar herb, and no source we cite links it to glucose control.
- Label name: Guarana (Paullinia cupana) Seed Extract.
- Place: 3 of 22 in the Proprietary Herbal Blend.
- Partner caffeine source: green tea leaf extract, place 7.
Daily total
How do you count caffeine when taking GlucoZen?
Add up every source, then leave room for the drops.
Start with the FDA figure. About 400 mg a day, roughly two to three 12-ounce cups of coffee, is not generally linked to negative effects in most adults (FDA, Caffeine). Some people feel caffeine at much less.
List your usual sources
Coffee, tea, soda, energy drinks and any pre-workout or diet products. Check their labels for caffeine.
Add the drops as an unknown
GlucoZen adds caffeine twice a day in an unprinted amount. Treat it as a small extra serving, not zero.
Watch for early signs
Jitters, a racing heart, headache or poor sleep can mean too much caffeine (FDA, Caffeine).
Cut back on other sources first
If you feel wired, trim coffee or energy drinks before anything else, and tell your clinician.
Dosing basics for the drops are on the how to use page.
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Order nowSide effects
What are the side effects of guarana?
Nausea and insomnia are the common ones. Memorial Sloan Kettering lists both, and links high doses of guarana supplements to vomiting, heart rhythm changes, high blood pressure and seizures (MSKCC, Guarana).
Too much caffeine from any source can cause a fast heart rate, palpitations, anxiety, jitters, nausea and headache, per FDA (FDA, Caffeine). Green tea extract adds its own notes: nausea, stomach upset and higher blood pressure (NCCIH, Green tea).
GlucoZen's guarana share is capped at about 67 mg of extract per serving. The serious effects above were tied to high supplement doses. The real issue is that the label hides the caffeine number, so you cannot check.
Ask first
Who should be careful with guarana in GlucoZen?
People who take blood thinners or other stimulants should ask before use. Memorial Sloan Kettering says combining guarana with other stimulants may not be safe, and that guarana may increase bleeding risk with blood thinners such as warfarin (MSKCC, Guarana).
Talk with your clinician first if you take a blood thinner, use stimulant products, have high blood pressure or heart rhythm problems, or are sensitive to caffeine.
Licorice compound and green tea extract carry other cautions in the same blend. The green tea extract profile covers the liver flag, and the side effects page lists everything in one place.
Profile
Guarana in GlucoZen at a glance
| Label name | Guarana (Paullinia cupana) Seed Extract |
|---|---|
| What it is | Paullinia cupana seed |
| Type | Natural caffeine source |
| Position on the label | 3 of 22 in the blend |
| Amount per serving | Not printed (at most about 67 mg of extract per serving); caffeine not printed |
| What research shows | Most of guarana's effects come from caffeine; 400 mg of caffeine a day is the usual adult ceiling |
| Strength of evidence | Caffeine, not a blood sugar herb |
| Why it is in the formula (brand view) | Energy and metabolism angle |
| Main caution | Adds an unknown amount of caffeine, on top of green tea. Avoid with other stimulants; ask first if you take a blood thinner. |
See all 23 actives on the ingredients page.
FAQ
GlucoZen guarana and caffeine FAQ
How much caffeine is in GlucoZen drops?
The label does not say. Guarana and green tea extracts both contain caffeine, but only the 200 mg blend total is printed. By list order, guarana extract is at most about 67 mg per serving, and its caffeine is a smaller part of that.
Can I drink coffee while taking GlucoZen?
Many adults can, but count it. FDA cites 400 mg of caffeine a day, about two to three 12-ounce cups of coffee, as generally fine for most adults. GlucoZen adds an unprinted amount, so leave room and watch for jitters.
Is guarana safe with warfarin?
Ask your clinician first. Memorial Sloan Kettering says guarana may increase bleeding risk with blood thinners such as warfarin. GlucoZen also contains Asian ginseng, which may interfere with blood clotting.
Does guarana help with blood sugar?
No source we cite shows that. Guarana's effects come mostly from its caffeine, and it is not a recognized blood sugar herb. Its place in GlucoZen fits an energy and metabolism angle in the marketing.
What happens if you take too much guarana?
High doses of guarana supplements have been linked to vomiting, heart rhythm changes, high blood pressure and seizures. Milder signs of too much caffeine include a racing heart, jitters, headache and poor sleep. Never take more than the label's 2 mL a day.
Can GlucoZen keep you from sleeping?
It might, for caffeine-sensitive people. Guarana and green tea both carry caffeine, and insomnia is a common guarana side effect. Asian ginseng in the blend can also cause insomnia. Tell your clinician if sleep changes.
Who wrote this
Written and reviewed by
Plain-language pages built from the label, the sales site and linked public health sources.
Last updated . Read our editorial standards and how we check reviews. This website is run by Theglucozen, a USA authorized GlucoZen retailer, not by the manufacturer. We earn money when you buy through our order links.
Keep reading
More about GlucoZen
Ingredients
All 23 label ingredients, the most each one can weigh, and what research says about them.
Read more
Green tea extract
Green tea extract sits seventh in the blend: a small, hidden amount with some caffeine and a rare liver risk.
Read more
Side effects
Low blood sugar, caffeine, licorice, green tea extract and pet risks: each GlucoZen caution, and when to stop.
Read moreUSA authorized GlucoZen retailer
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