Irvingia gabonensis
Irvingia gabonensis — marketed as 'African mango' — became a popular weight-loss supplement after a 2009 Cameroonian RCT reported ~12 kg weight loss in 10 weeks at 300 mg/day of standardized seed extract. The catch: every published RCT comes from the same research group, no independent team has replicated the result, and the 2013 systematic review explicitly flagged poor methodology and likely publication bias. Treat the weight-loss claim as unproven until independent replication appears.
Quick decision guide
May help most
Honestly, no one based on current evidence quality. If you want to trial it for general metabolic support, do so understanding the evidence is preliminary and from a single source.
Common dosing range
150 mg standardized seed extract (IGOB131) twice daily (300 mg/day total), 30 minutes before main meals — the protocol in the most-cited Ngondi 2009 trial.
When to expect effects
Reported within 4–10 weeks in the original trials. Independent replication is lacking, so real-world expectations should be modest.
Watch out for
Don't substitute for evidence-based weight management (caloric deficit, exercise, behavioral therapy, GLP-1 agonists when indicated). Mild side effects reported (headache, flatulence, sleep issues).
Evidence snapshot
What is it
Irvingia gabonensis is the botanical name for African bush mango (also called African mango or wild mango), a tree native to West and Central Africa. Its dried seed kernel, traditionally used in West African cuisine as a soup thickener (called 'ogbono'), is the basis for popular weight-loss supplements.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
Weight loss (overweight adults) Limited Evidence | Reported weight losses of 4–13 kg over 4–10 weeks in original trials; independent replication absent | Overweight adults who understand the evidence base limitations and use it as an adjunct to lifestyle change, not a substitute | Trials ran 4–10 weeks |
Cholesterol and lipid profile Limited Evidence | Reported total cholesterol and LDL reductions in original trials only; not independently confirmed | None as a primary lipid-management strategy | 4–10 weeks in original trials |
Glycemic control Mixed Evidence | Reported alongside weight loss; independent glycemic effect not demonstrated | None as a primary glycemic strategy | Not established |
Appetite and satiety Mixed Evidence | No isolated human satiety data; possible fiber-mediated effect | None | Not established |
Weight loss (overweight adults)
- Effect
- Reported weight losses of 4–13 kg over 4–10 weeks in original trials; independent replication absent
- Best fit
- Overweight adults who understand the evidence base limitations and use it as an adjunct to lifestyle change, not a substitute
- Time
- Trials ran 4–10 weeks
Cholesterol and lipid profile
- Effect
- Reported total cholesterol and LDL reductions in original trials only; not independently confirmed
- Best fit
- None as a primary lipid-management strategy
- Time
- 4–10 weeks in original trials
Glycemic control
- Effect
- Reported alongside weight loss; independent glycemic effect not demonstrated
- Best fit
- None as a primary glycemic strategy
- Time
- Not established
Appetite and satiety
- Effect
- No isolated human satiety data; possible fiber-mediated effect
- Best fit
- None
- Time
- Not established
Evidence for 4 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
Weight loss (overweight adults)
Supplement benefitThe 2013 Onakpoya systematic review pooled three RCTs (n=208) and reported significant weight loss with Irvingia gabonensis vs placebo. The most-cited single study (Ngondi 2009) reported a 12.8 kg loss in 10 weeks at 300 mg/day — an effect size that exceeds even prescription GLP-1 agonists. Critically: all included trials originated from the same Cameroonian research group, methodological quality was rated poor (Jadad ≤2), and no independent group has replicated these findings in the 15+ years since publication. MSKCC About Herbs and most independent reviewers treat the weight-loss claim as unverified.
Bottom line: Don't believe the headline numbers. Until an independent group replicates, treat this as a low-confidence supplement and don't substitute it for evidence-based weight management.
Evidence is mixed
All published RCTs come from a single research group, methodological quality is poor (Jadad ≤2 in most), and the reported effect sizes are implausibly large compared with prescription weight-loss medications. The 2013 systematic review explicitly called for independent rigorous RCTs that have not materialized. This is a textbook publication-bias and source-concentration problem.
Cholesterol and lipid profile
Biomarker supportThe same Ngondi trials reported significant reductions in total cholesterol, LDL, and triglycerides, with HDL increases. As with the weight-loss outcomes, these come from a single research group and have not been independently replicated. Mechanistic plausibility (soluble fiber content, possible bile-acid binding) exists, but the clinical evidence is too narrow to recommend for lipid management.
Bottom line: Don't use it for cholesterol management. Statins, ezetimibe, PCSK9 inhibitors, and dietary changes (soluble fiber, plant sterols) have far stronger evidence.
Evidence is mixed
Same single-source concern as the weight-loss evidence. Independent replication has not appeared.
Glycemic control
Mechanism onlySome Ngondi trials reported fasting glucose reductions alongside weight loss. Because weight loss itself improves glucose, it's not clear whether Irvingia has any direct glycemic effect independent of weight change. Soluble fiber from the seed could plausibly blunt post-meal glucose, but dedicated controlled trials are absent.
Bottom line: Inseparable from any weight-loss effect. Not a diabetes treatment.
Appetite and satiety
Mechanism onlyMarketing emphasizes a leptin-modulating mechanism, often citing in-vitro / animal data. No well-controlled human satiety study isolates Irvingia's appetite effect from its fiber content. The fiber alone (the seed is fiber-rich) is a more parsimonious explanation than any specific phytochemical action.
Bottom line: The leptin / appetite marketing outruns the data. If you want a fiber-based satiety aid, psyllium has better evidence.
How it works
How to take it
What to track
Bottom line: If you trial it, use the standardized 300 mg/day IGOB131 protocol before meals for 8–10 weeks. Stop and reassess if no effect — and don't drop diet, exercise, or prescribed weight-loss medications.
4 commercial forms
Compare the main delivery options and what they’re best suited for.
Standardized seed extract (IGOB131)
Studied formThe proprietary standardized extract used in the most-cited Ngondi 2009 trial. Studied dose: 150 mg twice daily before meals. Independent replication of the reported effects is still absent.
The form in the primary trials; not necessarily superior — just the one tested.
Whole-seed powder
TraditionalCrushed Irvingia gabonensis seed (called 'ogbono' or 'dika nut' in West African cuisine) used as a soup thickener for generations. Used in Ngondi 2005 trial at ~3 g/day. Much higher fiber content per dose than the concentrated extract.
Fiber-mediated rather than concentrated phytochemical action.
Generic 'African mango' extract (non-standardized)
AvoidMany products simply label 'African mango extract' without specifying extract ratio or active marker. Quality is unknown and label dose may bear little relation to the studied protocol.
Unverifiable — buy only standardized, third-party-tested products if any.
Combination 'fat burner' formulas
UninterpretableIrvingia mixed with caffeine, green tea extract, garcinia, raspberry ketones, etc. Any effect cannot be attributed to Irvingia specifically. Adulteration with undeclared stimulants or weight-loss drugs has been a recurring problem in this category.
Don't use — efficacy and safety are both unverifiable.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
Reported hypoglycemia risk when combined with diabetes medications (sulfonylureas, insulin) — monitor glucose carefully if used in this setting.
Pregnancy and breastfeeding safety has not been studied — avoid in these populations.
Who should avoid it
- Pregnant or breastfeeding people — no safety data.
- People with diabetes on insulin or sulfonylureas — risk of hypoglycemia.
- People allergic to mango or other Anacardiaceae family plants (though Irvingia is in a different family, cross-reactivity has been theorized).
- Anyone hoping to substitute it for evidence-based weight management or lipid therapy.
Pregnancy & breastfeeding
Safety in pregnancy and lactation has not been studied. Given the unproven efficacy and lack of safety data, avoid Irvingia gabonensis supplementation during pregnancy and breastfeeding.
Bottom line: Generally well-tolerated in the short-term trials, with mild GI/sleep side effects. The bigger 'safety' concern is opportunity cost: relying on it instead of evidence-based weight management.
Interactions
Theoretical and case-report hypoglycemia risk when combined with glucose-lowering medications. Monitor blood glucose carefully if used in this setting.
Theoretical bleeding risk from fiber-mediated effects on absorption of fat-soluble drugs; no documented clinically significant interaction.
Like other fiber-rich supplements, Irvingia seed powder can slow absorption of oral medications taken simultaneously. Separate by at least 2 hours when timing matters (e.g., levothyroxine, antibiotics).
Food sources
| Food | Amount | %DV |
|---|---|---|
| Dika nut / ogbono (West African cuisine) | 1 Tbsp (~10 g, used as soup thickener) | — |
| Irvingia gabonensis fruit pulp (raw, in West/Central Africa) | 1 fruit | — |
| Standardized seed extract (supplement only) | 150 mg per capsule (IGOB131 protocol) | — |
Dika nut / ogbono (West African cuisine)
- Amount
- 1 Tbsp (~10 g, used as soup thickener)
- %DV
- —
Irvingia gabonensis fruit pulp (raw, in West/Central Africa)
- Amount
- 1 fruit
- %DV
- —
Standardized seed extract (supplement only)
- Amount
- 150 mg per capsule (IGOB131 protocol)
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Is Irvingia the same as African mango?⌄
Yes. 'African mango' and 'African bush mango' are common names for Irvingia gabonensis.
Why does IGOB-131 matter?⌄
Nearly all published clinical evidence used this specific standardized extract. Products without IGOB-131 may have different active content and unproven clinical effects.
Does eating ogbono soup count?⌄
Culinary doses are much smaller than supplement doses, but traditional consumption provides nutritional value and may contribute modest amounts of the active compounds.
Will Irvingia interfere with my diabetes medication?⌄
It may enhance blood-sugar-lowering effects. Monitor glucose more closely and discuss dosing adjustments with your clinician.
How long does it take to see results?⌄
Clinical trials typically span 8-12 weeks. Effects on weight and waist circumference, if they occur, are usually noticeable in this timeframe.
References by claim
Weight loss (overweight adults)
Onakpoya et al., 2013 — Journal of Dietary Supplements — Systematic Review (2013) link
Ngondi et al., 2009 — Lipids in Health and Disease (2009) link
Sun & Chen, 2012 — Journal of Medicinal Food — Narrative Review (2012) link
Memorial Sloan Kettering — About Herbs: Irvingia — MSKCC Integrative Medicine — African Mango (2024) link
Cholesterol and lipid profile
Ngondi et al., 2005 — Lipids in Health and Disease (2005) link
Track Irvingia gabonensis with Pilora
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Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.