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Metabolic HealthWeight ManagementGut HealthGLP-1 Support

Yacon Syrup

Smallanthus sonchifolius
Evidence Level
Limited
3 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Yacon syrup is a low-glycemic sweetener from the Andean yacon root, rich in fructooligosaccharides (FOS). Modest evidence supports benefits for body weight, insulin resistance, and stool frequency in obese pre-menopausal women.

Studied Dose PIVOTAL: 0.14 g FOS/kg/day × 120 d (~10 g FOS = 20-25 g syrup for 70-kg adult). TOXICITY: 0.29 g/kg/day → GI effects. Commercial syrup FOS varies 40-65% — check labels.
Active Compound Fructooligosaccharides (FOS) — primarily inulin-type fructans (40-70% of dry weight)

Benefits

Body Weight, Waist, and BMI Reduction

The RCT (n=55, 120 days, double-blind, placebo-controlled) in obese pre-menopausal women showed significant decreases in body weight, waist circumference, and BMI with yacon syrup at 0.14 g FOS/kg/day. Effect size was modest but clinically meaningful in this population.

Supported by Trial 1

Insulin Resistance Improvement

Genta 2009 documented significant decreases in fasting serum insulin and HOMA-IR (Homeostasis Model Assessment for Insulin Resistance) over 120 days. All participants had baseline elevated HOMA-IR (>2.70 cutoff). No effect on fasting glucose (already normo-glycemic). Effects align with FOS-mediated GLP-1 elevation and gut microbiome modulation.

Supported by Trial 1

LDL Cholesterol Reduction

found a significant decrease in serum LDL-cholesterol with yacon syrup, while total cholesterol and triglycerides were not significantly changed. The 2025 Pereira systematic review (7 trials, n=161) confirmed LDL reduction as a consistent finding across yacon trials.

Supported by Trial 2, Trial 1

Increased Defecation Frequency and Satiety

Genta 2009 documented increased defecation frequency and satiety sensation with yacon syrup. FOS is a well-established prebiotic and bulk-forming dietary fiber; satiety effects likely involve FOS-mediated GLP-1 and PYY elevation. Gut transit benefits are consistent across studies.

Supported by Trial 1, Trial 2

Prebiotic / Gut Microbiome Support

FOS is selectively fermented by Bifidobacterium and Lactobacillus species, supporting beneficial gut microbiome composition. This is the same mechanism as inulin and other fructan prebiotics. The 2025 Pereira systematic review noted improvements in intestinal transit and gut microbiota across yacon trials.

Supported by Trial 2

Mechanism of action

1

Fructooligosaccharide (FOS) Prebiotic Effect

Yacon syrup is exceptionally rich in inulin-type FOS (40-70% of dry weight) — among the highest natural sources known. FOS is non-digestible by human enzymes but selectively fermented by colonic Bifidobacterium and Lactobacillus, producing short-chain fatty acids (SCFAs: acetate, propionate, butyrate) with metabolic and anti-inflammatory benefits.

2

GLP-1 and PYY Elevation (Incretin/Satiety Hormones)

Colonic SCFA production from FOS fermentation stimulates L-cell secretion of GLP-1 (incretin, postprandial insulin enhancer) and PYY (peptide YY, satiety hormone). This explains the satiety and insulin sensitivity benefits documented in the Genta 2009 trial.

3

Reduced Caloric Density (Low-Glycemic Sweetener)

FOS provides ~1.5-2 kcal/g vs. ~4 kcal/g for sucrose — and most of those calories come from colonic SCFAs that are partially used by gut bacteria. As a sweetener replacement, yacon syrup substantially reduces glycemic load and net caloric impact.

4

Bulk Stool Formation and Transit

Like other soluble fibers, FOS adds water-binding bulk to stool and may accelerate colonic transit. This explains the increased defecation frequency in Genta 2009 and supports general gut health applications.

5

Modest Mineral Absorption Enhancement

FOS may modestly enhance calcium and magnesium absorption via colonic SCFA-induced mineral solubilization. Effects are real but usually small; relevance for osteoporosis prevention is mechanism-based rather than RCT-confirmed for yacon specifically.

Clinical trials

1
Genta 2009 — Yacon Syrup for Obesity and Insulin Resistance (Foundational RCT)
PubMed

Double-blind, placebo-controlled trial. Two doses of yacon syrup (0.29 g and 0.14 g FOS/kg/day) vs. placebo for 120 days in obese pre-menopausal women. Anthropometric measurements, blood glucose, calcium, lipid and insulin concentrations, HOMA-IR. (Genta, Cabrera, Habib, Pons, Carillo, Grau, Sánchez 2009, Clin Nutr)

Obese, slightly dyslipidemic pre-menopausal women with baseline insulin resistance (HOMA-IR > 2.70).

Recommended dose without GI side effects: 0.14 g FOS/kg/day. Significant decreases in body weight, waist circumference, and BMI. Significant decreases in fasting serum insulin and HOMA-IR. Significant LDL cholesterol reduction. Increased defecation frequency and satiety sensation. Fasting glucose unchanged. Higher dose (0.29 g/kg) caused GI side effects. Foundational RCT establishing yacon syrup as a beneficial functional food for obese insulin-resistant women.

2
Pereira 2025 — Yacon Syrup Human Health Systematic Review
PubMed

PRISMA-compliant systematic review of yacon syrup clinical trials over the last decade. Searched Medline (PubMed), Science Direct, Embase, Scopus, SciELO through October 2024. Inclusion: clinical trials of yacon syrup on glycemic control, lipid profile, insulin sensitivity, appetite regulation, gut microbiota in healthy/overweight/obese individuals. (Pereira et al. 2025, Nutrients)

7 RCTs included, totaling 161 participants from diverse populations.

Yacon syrup supplementation demonstrated significant reductions in fasting insulin, HOMA-IR, and LDL cholesterol, alongside improvements in satiety and intestinal transit. Findings were consistent across trial heterogeneity. Authors noted evidence quality concerns (small sample sizes, dose variability) and called for larger trials.

3
Machado 2019 — Yacon Flour for Body Composition and Bowel Function
PubMed

Randomized, double-blind, placebo-controlled clinical trial of yacon flour vs. placebo in overweight adults. Outcomes: body composition, intestinal function. (Machado, da Silva, Chaves, Alfenas 2019, Clin Nutr ESPEN)

Overweight adults.

Yacon flour consumption improved body composition and intestinal function vs. placebo. Provides additional evidence beyond syrup form that yacon-derived FOS supports weight management and gut function. Effect sizes modest but consistent with mechanism.

Side effects and drug interactions

Common Potential side effects

GI symptoms (gas, bloating, abdominal cramping, diarrhea) at doses above 0.14 g FOS/kg/day or with rapid dose escalation. Start low and increase gradually.
Possible osmotic diarrhea at high doses.
Allergic reactions are uncommon but documented (one case report of anaphylaxis after yacon ingestion: PMID 20358031).
FOS may aggravate symptoms in IBS or SIBO (small intestinal bacterial overgrowth) due to fermentation.
Not appropriate for those on low-FODMAP diets.
Pregnancy and lactation: yacon is consumed as food in Andean regions; supplemental yacon syrup at moderate doses is likely safe but rigorous data is absent.
Children: introduce gradually; high doses may cause GI symptoms more readily.

Important Drug interactions

Diabetes medications (insulin, sulfonylureas): yacon's insulin sensitivity effects may be additive — monitor blood glucose.
Other prebiotics or probiotics: generally synergistic; no specific concerns.
Iron supplements: theoretical interaction via mineral absorption changes — clinical relevance unclear.
Antibiotics: short-term yacon use during antibiotic courses may help maintain microbiome balance, though this is not specifically RCT-demonstrated.
No major drug interactions documented.

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Frequently asked questions about Yacon Syrup

What is Yacon Syrup?

Yacon syrup is a low-glycemic sweetener from the Andean yacon root, rich in fructooligosaccharides (FOS).

What does Yacon Syrup do?

Yacon syrup is exceptionally rich in inulin-type FOS (40-70% of dry weight) — among the highest natural sources known. In clinical research, Yacon Syrup has been studied for body weight, waist, and bmi reduction, insulin resistance improvement, ldl cholesterol reduction.

Who should take Yacon Syrup?

Yacon Syrup may be most relevant for people interested in metabolic health, weight management, gut health. It has been clinically studied for body weight, waist, and bmi reduction, insulin resistance improvement, ldl cholesterol reduction. As with any supplement, consult your healthcare provider before starting, especially if you have medical conditions or take prescription medications.

How long does Yacon Syrup take to work?

Most clinical trial effects appear over weeks of consistent use; individual response varies. Acute or same-day effects (where applicable) typically appear within hours, but most cumulative benefits — particularly those affecting biomarkers, mood, sleep quality, or chronic symptoms — require 4-12 weeks of regular use to fully assess. If you don't notice benefit after 12 weeks at the appropriate dose, it may not be your responder.

When is the best time to take Yacon Syrup?

For cardiovascular or metabolic goals, Yacon Syrup is typically taken with meals to support absorption and reduce GI sensitivity. Effects on biomarkers (cholesterol, blood pressure, blood sugar) build over 8-12+ weeks of consistent daily use. Always check product labeling and follow personalized guidance from your healthcare provider.

Is Yacon Syrup worth taking?

Yacon Syrup has limited clinical evidence (Evidence Level 2/5 on NutraSmarts) — preliminary research suggests potential benefit, but more rigorous trials are needed. Whether it's worth taking depends on your specific goals, what you've already tried, your budget, and your overall supplement strategy. The honest framing: no supplement is essential for most people, and lifestyle factors (sleep, exercise, diet, stress management) typically produce larger effects than any single supplement. Yacon Syrup is most worth trying if its evidence-supported uses align with your specific goals.

What is the recommended dosage of Yacon Syrup?

The clinically studied dose for Yacon Syrup is PIVOTAL: 0.14 g FOS/kg/day × 120 d (~10 g FOS = 20-25 g syrup for 70-kg adult). TOXICITY: 0.29 g/kg/day → GI effects. Commercial syrup FOS varies 40-65% — check labels.. Always follow product labeling and consult a healthcare provider for personalized dosing recommendations.

What is Yacon Syrup used for?

Yacon Syrup is studied for body weight, waist, and bmi reduction, insulin resistance improvement, ldl cholesterol reduction. The RCT (n=55, 120 days, double-blind, placebo-controlled) in obese pre-menopausal women showed significant decreases in body weight, waist circumference, and BMI with yacon syrup at 0.14 g FOS/kg/day.