Last verified: today
Monk Fruit
Also known as: Luo Han Guo, Siraitia grosvenorii, monk fruit extract, mogroside, mogroside V, siamenoside I
Evidence under review. — Not yet rated
Zero-calorie natural sweetener. Doesn't spike blood sugar, but won't help you eat less overall.
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What it does
Monk fruit is a small melon native to Southeast Asia whose extract is 150-300 times sweeter than sugar with zero calories. The sweetness comes from compounds called mogrosides. As a sugar...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
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Found in
Thorne Magnesium Bisglycinate, Livehealthillie, 310 Organic Vanilla Shake and 5 more
What the Science Says
Monk fruit is a small melon native to Southeast Asia whose extract is 150-300 times sweeter than sugar with zero calories. The sweetness comes from compounds called mogrosides. As a sugar substitute in drinks, it produces minimal blood glucose and insulin spikes compared to sucrose, making it appealing for people managing blood sugar. Animal research suggests it may improve fasting blood glucose in obese subjects, but human evidence is limited and mostly short-term.
What It Doesn't Do
Won't help you eat fewer calories overall — studies show people compensate by eating more at the next meal. No proven weight loss benefit in humans. Not a treatment for diabetes or obesity. Don't assume 'natural' means unlimited safety — rat studies at high doses raised liver enzyme concerns.
Evidence-Based Benefits
Doesn't cause the blood sugar spike that a sugary drink does when consumed as a beverage.
Moderate EvidenceEffective at: Equisweet to 65g sucrose in beverage form
Supporting studies (click to view on PubMed):
Produces a much smaller insulin spike than sugar-sweetened drinks in healthy adults.
Moderate EvidenceEffective at: Equisweet to 65g sucrose in beverage form
Supporting studies (click to view on PubMed):
Activates reward-related brain areas differently than sugar, more like plain water than a sugary drink.
Weak EvidenceEffective at: 500 mL equisweet flavored water
Supporting studies (click to view on PubMed):
Reduced fasting blood glucose in obese mice without promoting additional weight gain, unlike sucralose or sucrose.
Weak EvidenceEffective at: 1.1 g/L in drinking water (~50% mogroside V) for 8 weeks
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown — mogrosides are poorly absorbed in the gut; most pass to the colon. Human pharmacokinetic data not provided in the available studies.
Red Flags to Watch For
- High-dose rat studies showed dose-dependent liver damage including elevated ALT, oxidative stress markers, and tissue necrosis — human relevance unclear but warrants caution
- Calorie compensation: human trials show people eat more at subsequent meals after consuming monk fruit beverages, negating any calorie savings
- Most positive metabolic data comes from animal (mouse/rat) studies, not human clinical trials
- Products vary widely in mogroside concentration — 'monk fruit extract' on a label tells you little about actual dose or potency
Products Containing Monk Fruit
See how Monk Fruit is used in these analyzed products:
Thorne Magnesium Bisglycinate
Supplement
Livehealthillie
Supplement
310 Organic Vanilla Shake
Supplement
Naked Nutrition Grass Fed Whey Protein Powder
Supplement
Koia Elite Plant Based Protein Shake (Vanilla)
Supplement
Goodprotein
KOS Organic Superfood Greens - Apple Flavor
Supplement
VitaHustle ONE
Supplement
Frequently Asked Questions
What does Monk Fruit do?
Zero-calorie natural sweetener. Doesn't spike blood sugar, but won't help you eat less overall.
What is the effective dose of Monk Fruit?
No established dose
Is Monk Fruit safe?
High-dose rat studies showed dose-dependent liver damage including elevated ALT, oxidative stress markers, and tissue necrosis — human relevance unclear but warrants caution
What doesn't Monk Fruit do?
Won't help you eat fewer calories overall — studies show people compensate by eating more at the next meal.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-09-24