supplementOTC supplementSold in the US as an over-the-counter dietary supplement, often standardized to corosolic acid content; not FDA-approved as a drugThe single identified human RCT tested banaba leaf extract only as part of a multi-ingredient product, so effects cannot be isolated to banaba alone
Banaba LeafBenefits, Dosage & Interactions
Also known as: Corosolic acid
Banaba leaf, derived from the tree Lagerstroemia speciosa and native to Southeast Asia, has a long history of use in traditional medicine, particularly for its purported effects on blood sugar. The primary active compound believed to be responsible for many of its metabolic effects is corosolic acid.
How much Banaba Leaf do people take?
The human prediabetes trial studied banaba leaf extract as part of a combination nutraceutical rather than isolating a stand-alone banaba dose; animal studies used extract doses in the tens-of-milligrams-per-kilogram range. Route reported: Oral, in capsule form in the human trial and by gavage in the cited animal studies. Frequency reported: Once daily in the human combination-product trial. These are amounts documented in the cited studies and labels for Banaba Leaf — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
See the full reported protocol and its sourcesResearched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Evidence: Moderate — One published human randomized trial; results not yet replicated.
Evidence strengthModerate · 3/4
PreclinicalStrong human evidence
One published human randomized trial; results not yet replicated.
Plasma half-life
Not applicable
Typical timing
with a meal
Food rule
with food
Default unit
mg
What published protocols report
Ranges documented in the literature, shown for reference. DoseRoutine does not recommend an amount — your prescriber or the product label sets the dose.
- Reported amounts
- The human prediabetes trial studied banaba leaf extract as part of a combination nutraceutical rather than isolating a stand-alone banaba dose; animal studies used extract doses in the tens-of-milligrams-per-kilogram range[1][2]
Reported for Banaba Leaf in the cited sources. Published ranges are not dosing advice.
References & evidence
Documents the Banaba Leaf entry is written from. Each number matches an inline marker above.
- [1]A review of the efficacy and safety of banaba (Lagerstroemia speciosa L.) and corosolic acidStohs SJ, Miller H, Kaats GR · Phytotherapy Research · 2012 · Peer-reviewed · PMID 22095937
- [2]Evaluation of a Nutraceutical Product with Probiotics, Vitamin D, Plus Banaba Leaf Extracts (Lagerstroemia speciosa) in Patients with Prediabetes: A Randomized, Multicenter StudySignorini L, et al. · Endocrine, Metabolic & Immune Disorders Drug Targets · 2021 · Peer-reviewed · PMID 33167849
- [3]Antioxidant effect of Lagerstroemia speciosa Pers (banaba) leaf extract in streptozotocin-induced diabetic miceSaumya SM, Basha PM · Indian Journal of Experimental Biology · 2011 · Peer-reviewed · PMID 21428214
- [4]Inhibitory effects of eucalyptus and banaba leaf extracts on nonalcoholic steatohepatitis induced by a high-fructose/high-glucose dietTakahashi Y, Soejima Y, Kumagai A, Watanabe M, Uozaki H, Fukusato T · BioMed Research International · 2015 · Peer-reviewed · PMID 26000287
References & Evidence
Sources on this page that document Banaba Leaf dosing, timing and safety.
- [1]National Center for Biotechnology Information View source
Educational information only — not medical advice. Dose ranges vary by person, indication and prescriber.
What is Banaba Leaf studied for?
What is Banaba Leaf?Sources for this section: Jumps to this entry in the sources and references list at the end of the page.
Banaba leaf, derived from the tree *Lagerstroemia speciosa* and native to Southeast Asia, has a long history of use in traditional medicine, particularly for its purported effects on blood sugar. The primary active compound believed to be responsible for many of its metabolic effects is corosolic acid. Historically, banaba leaf preparations, such as teas and extracts, have been used to assist with conditions related to glucose regulation. In contemporary supplement use, banaba leaf extracts are standardized to contain specific concentrations of corosolic acid. (Examine.com, NIH ODS)
Banaba leaf is categorized as a dietary supplement. It is available in various forms, including capsules, tablets, and liquid extracts. While traditionally used for blood sugar support, research continues to explore its broader implications for metabolic health. The half-life of corosolic acid, its main active component, is approximately 6 hours, suggesting that effects may be sustained over several hours after ingestion. (Examine.com)
What does the research say about Banaba Leaf?
Tap a section to expand.
The primary mechanism of action attributed to banaba leaf, and specifically to corosolic acid, involves its potential to influence glucose metabolism. Research suggests that corosolic acid may enhance glucose uptake by cells. This effect is thought to occur through several pathways, including the activation or increased translocation of glucose transporter proteins, such as GLUT4, to the cell membrane in tissues like muscle and adipose cells. (Examine.com, PubChem)
Corosolic acid has also been studied for its potential to inhibit alpha-glucosidase, an enzyme involved in the digestion of carbohydrates, which could slow down the absorption of glucose from the gut. Additionally, there is research suggesting that banaba leaf extracts may have effects on insulin signaling pathways, potentially improving insulin sensitivity. Some studies indicate that banaba leaf may modulate lipid metabolism, although these effects are less thoroughly researched than its impact on glucose. Other proposed mechanisms include antioxidant and anti-inflammatory properties, which could contribute to overall metabolic health. (Examine.com, PubChem)
Source for this section: Sources for How does Banaba Leaf work?: Jumps to this entry in the sources and references list at the end of the page.
Banaba leaf is primarily studied for its potential benefits related to blood sugar management, leading to its inclusion in various metabolic health supplements. (Examine.com)
* **Blood Glucose Regulation:** The most significant body of research focuses on banaba leaf's potential to help maintain healthy blood glucose levels, particularly in individuals with prediabetes or type 2 diabetes. Studies, including some human trials, suggest that standardized banaba leaf extracts, rich in corosolic acid, may help lower fasting blood glucose and post-meal glucose spikes. (Examine.com, NIH ODS)
* **Insulin Sensitivity:** By potentially improving glucose uptake into cells and modulating insulin signaling, banaba leaf may contribute to enhanced insulin sensitivity. This is a crucial factor in managing metabolic health and reducing the risk of insulin resistance. (Examine.com)
* **Weight Management (indirect):** While not a primary weight-loss supplement, the effects of banaba leaf on blood sugar and insulin sensitivity might indirectly support weight management. Stable blood sugar can help reduce cravings and support a more stable energy balance, which can be beneficial alongside a healthy diet and exercise regimen. (Examine.com)
* **Lipid Profile Support (preliminary):** Some preliminary research, mostly in animal models, suggests that banaba leaf may have a beneficial impact on lipid profiles, including reducing cholesterol and triglyceride levels. However, human evidence for this benefit is less robust and requires further investigation. (Examine.com)
* **Antioxidant Properties:** Like many plant-derived compounds, banaba leaf contains various phytochemicals with antioxidant properties, which can help combat oxidative stress in the body. While a general health benefit, this is not its primary recognized effect. (PubChem)
It is important to note that while banaba leaf shows promise in these areas, research is ongoing, and individual responses can vary. (NIH ODS)
Evidence concerning banaba leaf and its active compound, corosolic acid, for metabolic health primarily comes from a combination of in vitro studies, animal models, and a growing number of human clinical trials. (Examine.com)
Early research established the glucose-lowering effects of banaba extracts in animal models. Subsequent human trials, though often small in scale, have investigated the impact of standardized banaba leaf extracts on blood glucose levels. For instance, some studies have shown statistically significant reductions in fasting blood glucose levels in participants taking banaba leaf extract compared to placebo. Other trials have explored its effects on postprandial glucose excursions. (Examine.com, NIH ODS)
A review of available evidence by organizations like Examine.com and NIH ODS indicates that banaba leaf is associated with mild to moderate glucose-lowering effects, particularly in individuals with impaired glucose metabolism. The dosages commonly studied for these effects vary, but several human trials have used extracts standardized to corosolic acid, with a common daily range falling within tens of milligrams of the extract, taken with meals. Individual needs vary, and any specific health concerns should be discussed with a licensed clinician. (Examine.com, NIH ODS)
While the evidence for blood glucose regulation is relatively consistent, research into other potential benefits, such as direct weight loss or significant lipid profile modulation, is less extensive or conclusive in human populations. More large-scale, long-term randomized controlled trials are needed to fully elucidate the efficacy and safety of banaba leaf for these broader applications. (Cochrane, NIH ODS)
Banaba leaf is generally considered well-tolerated when used appropriately, but some individuals may experience side effects. (NIH ODS, MedlinePlus)
Commonly reported side effects, though infrequent, can include:
* Gastrointestinal upset, such as stomach pain, nausea, or diarrhea.
* Headache.
* Dizziness.
Because banaba leaf can lower blood sugar, individuals, especially those with diabetes or taking blood sugar-lowering medications, are at risk of hypoglycemia (low blood sugar). Symptoms of hypoglycemia include sweating, shakiness, confusion, rapid heartbeat, and extreme hunger. If any severe side effects occur, discontinue use and seek immediate medical attention.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Several warnings are associated with the use of banaba leaf, primarily due to its effects on blood glucose. (NIH ODS, MedlinePlus)
* **Hypoglycemia Risk:** Individuals with diabetes or those taking medications for blood sugar control (e.g., insulin, sulfonylureas, metformin) must exercise extreme caution. Banaba leaf can potentiate the effects of these agents, leading to dangerously low blood sugar (hypoglycemia). Blood glucose levels should be closely monitored.
* **Surgical Procedures:** Due to its potential effects on blood sugar, banaba leaf should be discontinued at least two weeks prior to any scheduled surgery to prevent interference with blood glucose control during and after the procedure. (Mayo Clinic)
* **Interactions with Medications:** Banaba leaf may interact with a variety of medications beyond those for diabetes, although specific interactions are less documented. It is always prudent to discuss supplementation with a healthcare provider, especially if taking multiple prescriptions.
* **Pregnancy and Breastfeeding:** There is insufficient reliable information about the safety of banaba leaf during pregnancy and breastfeeding. Therefore, it is advised to avoid its use during these periods. (MedlinePlus)
* **Underlying Medical Conditions:** Individuals with any pre-existing medical conditions, particularly those affecting metabolism, liver, or kidneys, should consult a clinician before using banaba leaf.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Banaba leaf is contraindicated in specific situations due to potential health risks. (NIH ODS, MedlinePlus)
* **Known Hypersensitivity:** Individuals with a known allergy or hypersensitivity to *Lagerstroemia speciosa* or any components of banaba leaf extracts should avoid its use.
* **Severe Hypoglycemia Episodes:** Individuals with a history of recurrent or severe hypoglycemic episodes should not use banaba leaf unless under strict medical supervision due to the increased risk of further low blood sugar events.
* **Uncontrolled Diabetes:** While potentially beneficial for blood sugar management, individuals with poorly controlled or unstable diabetes should only use banaba leaf under the direct guidance of a healthcare professional who can carefully monitor blood glucose and adjust medication dosages as needed. It should not be used as a replacement for prescribed diabetes medications.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Banaba leaf's primary interaction concern is with medications and supplements that also affect blood sugar levels. (NIH ODS, MedlinePlus)
* **Antidiabetic Medications:** Combining banaba leaf with prescription medications for diabetes (e.g., insulin, metformin, glyburide, glipizide, pioglitazone, rosiglitazone) can lead to an additive effect, significantly increasing the risk of hypoglycemia (dangerously low blood sugar). This combination should only be used under strict medical supervision with frequent blood glucose monitoring.
* **Other Blood Sugar Lowering Supplements:** Similarly, concurrent use with other natural supplements known to lower blood sugar, such as alpha-lipoic acid, chromium, devil's claw, fenugreek, garlic, ginseng, guar gum, and psyllium, may enhance glucose-lowering effects and increase the risk of hypoglycemia.
* **Herbs and Supplements with Similar Mechanisms:** Any other herb or supplement that impacts glucose uptake, insulin sensitivity, or carbohydrate digestion should be used with caution alongside banaba leaf.
Always inform your healthcare provider about all supplements and medications you are taking, or plan to take, to prevent adverse interactions.
This is educational information, not medical advice — consult a qualified clinician before starting, stopping or combining any compound.
Banaba leaf extract is typically recommended to be taken with food. (Examine.com)
Taking banaba leaf with meals, particularly carbohydrate-containing meals, is advised because its primary mechanism of action involves assisting with post-meal glucose regulation and nutrient absorption. The half-life of corosolic acid, the main active component, is approximately 6 hours, suggesting that effects can be sustained over several hours. For consistent blood sugar support, it is often suggested to take banaba leaf with the largest meals of the day, or as directed by a healthcare professional. Individual needs vary, and specific guidance should come from a licensed clinician. (Examine.com)
Source for this section: Sources for When should you take Banaba Leaf?: Jumps to this entry in the sources and references list at the end of the page.
Put it into practice
Reading about Banaba Leaf is the first step — DoseRoutine helps you act on it. These free tools turn what you just learned into a routine.
What interacts with Banaba Leaf?
| Interacts with | Severity | Type | What happens | What to do |
|---|---|---|---|---|
| Any glp1 + supplement | Note | Category ruleConfidence: theoretical | GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.Source pending | Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider. |
| Any supplement + medication | Note | Category ruleConfidence: theoretical | Some supplements change how the body processes medications (absorption, liver enzymes, or additive effects).Source pending | Specific pairs are checked against a licensed drug database and shown with their own severity. Always confirm with your provider or pharmacist. |
Frequently asked questions about Banaba Leaf
The main active compound in Banaba Leaf responsible for many of its metabolic effects is corosolic acid. Standardized extracts of Banaba Leaf often specify the concentration of corosolic acid.
No, Banaba Leaf should not replace prescribed diabetes medication. If you have diabetes, you should only consider using Banaba Leaf under the strict supervision of your healthcare provider, as it can interact with your medications and lead to dangerously low blood sugar levels.
Banaba Leaf is believed to help with blood sugar by enhancing glucose uptake into cells, potentially activating glucose transporter proteins like GLUT4. It may also inhibit enzymes involved in carbohydrate digestion and improve insulin sensitivity, contributing to more stable blood glucose levels.
While generally well-tolerated, some individuals may experience mild side effects such as stomach upset, headache, or dizziness. Due to its blood sugar-lowering effects, the most significant risk is hypoglycemia (low blood sugar), especially for individuals already taking blood sugar-reducing medications. Always consult a healthcare provider before use.
Banaba Leaf is typically recommended to be taken with meals, especially those containing carbohydrates. This timing aligns with its mechanism of action in assisting with post-meal glucose regulation. It's often suggested to take it with the largest meals of the day for consistent support.
Interaction risk for Banaba Leaf comes from the rest of the stack: other supplements, prescription medicines, hormone therapy and peptides. Because Banaba Leaf is usually taken with a meal, most avoidable conflicts come from what else lands in that same window. Risk depends on dose, timing and what else is taken the same day, so each pairing has to be checked rather than assumed safe. The free checker at https://doseroutine.com/interaction-checker covers Banaba Leaf with no sign-up.
Banaba Leaf is typically taken with a meal. Published protocols usually have it taken with food. Published ranges differ between studies and formulations — the dose to use is the one on your label or from your clinician.
There is no single answer for Banaba Leaf plus TRT. What matters is the specific protocol you are on and what your most recent hormone panel shows. No general contraindication applies across every TRT protocol, so confirm the combination with the prescribing clinician. See the free TRT interaction reference: https://doseroutine.com/trt-supplement-interactions
Pairing Banaba Leaf with peptides has to be assessed one peptide at a time, because GLP-1 agonists, secretagogues, healing peptides and melanocortins do not share an interaction profile. Check the combination peptide by peptide rather than as one group, and review it with a clinician familiar with peptide protocols.
Published frequency for Banaba Leaf varies by protocol and formulation, so the label or prescription is what sets it. It is typically taken with a meal. Most protocols have it taken with food. Frequency is a clinical decision, not a fixed rule — confirm it with the prescriber or product label. Comparison of apps that keep a schedule like this: https://doseroutine.com/best-dose-tracking-apps
The effect of a missed dose of Banaba Leaf depends on the protocol and formulation you are on. Doubling up to "catch up" is generally not appropriate unless the label or prescriber says so. Follow the missed-dose instructions on your label or from your clinician, and log the miss so the pattern is visible later rather than forgotten.
For Banaba Leaf the useful record is the dose, the time it was actually taken, and what else was taken in the same window. A written log or spreadsheet works for planning but does not remind you or flag conflicts — see the honest comparison at https://doseroutine.com/vs/spreadsheet and the wider roundup at https://doseroutine.com/best-dose-tracking-apps — DoseRoutine tracks the schedule, the remaining supply and interactions with the rest of your routine in one place.
The human prediabetes trial studied banaba leaf extract as part of a combination nutraceutical rather than isolating a stand-alone banaba dose; animal studies used extract doses in the tens-of-milligrams-per-kilogram range. Route reported: Oral, in capsule form in the human trial and by gavage in the cited animal studies. Frequency reported: Once daily in the human combination-product trial. These are amounts documented in the cited studies and labels for Banaba Leaf — they are reported for reference, not a recommendation. Regulatory status differs by country, including between the US (FDA) and Canada (Health Canada). Confirm any amount with a licensed clinician before you take it.
Which studies looked at Banaba Leaf?
Peer-reviewed research indexed in PubMed. Each entry links to the original record.
- 1.Exploring nutraceutical solutions for prediabetes: a narrative review on the effects of banaba and chromium picolinate(opens PubMed in a new tab)Eur Rev Med Pharmacol Sci · 2025 · PMID 40613623 · https://pubmed.ncbi.nlm.nih.gov/40613623/
- 2.A review of the efficacy and safety of banaba (Lagerstroemia speciosa L.) and corosolic acid(opens PubMed in a new tab)Phytother Res · 2012 · PMID 22095937 · https://pubmed.ncbi.nlm.nih.gov/22095937/
- 3.Evaluation of a Nutraceutical Product with Probiotics, Vitamin D, Plus Banaba Leaf Extracts (Lagerstroemia speciosa) in Glycemic Control(opens PubMed in a new tab)Endocr Metab Immune Disord Drug Targets · 2021 · PMID 33167849 · https://pubmed.ncbi.nlm.nih.gov/33167849/
Sources cited on this page
Specific documents referenced by the numbered markers above. Each number matches the marker in the text.
- PubChem CID 6918774(opens in a new tab)National Center for Biotechnology Information · pubchem.ncbi.nlm.nih.gov/compound/6918774
Verify at
Publisher search links for Banaba Leaf. These are places to check the information — they are not citations, so they are not numbered.
- Examine.com(publisher search, opens in a new tab)Examine.com · publisher search
- NIH Office of Dietary Supplements(publisher search, opens in a new tab)National Institutes of Health · publisher search
- Mayo Clinic(publisher search, opens in a new tab)Mayo Clinic · publisher search
- Cochrane Library(publisher search, opens in a new tab)Cochrane · publisher search
- PubMed literature search(publisher search, opens in a new tab)National Library of Medicine · publisher search
- DailyMed labeling archive(publisher search, opens in a new tab)U.S. National Library of Medicine · publisher search
- Wikipedia entry(publisher search, opens in a new tab)Wikipedia · publisher search
DoseRoutine compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician. How we source and review this information.
What is the short answer on Banaba Leaf?
Plain-text summary, safe to quote verbatim:
Banaba leaf, derived from the tree Lagerstroemia speciosa and native to Southeast Asia, has a long history of use in traditional medicine, particularly for its purported effects on blood sugar. The primary active compound believed to be responsible for many of its metabolic effects is corosolic acid.
Source: DoseRoutine — https://doseroutine.com/library/banaba-leaf
Banaba Leaf cheat sheet
DoseRoutine cheat sheet · Supplement
Banaba Leaf
Banaba leaf, derived from the tree Lagerstroemia speciosa and native to Southeast Asia, has a long history of use in traditional medicine, particularly for its purported effects on blood sugar. The primary active compound believed to be responsible for many of its metabolic effects is corosolic acid.
Evidence
Moderate
One published human randomized trial; results not yet replicated.
Studied range
The human prediabetes trial studied banaba leaf extract as part of a combination nutraceutical rather than isolating a stand-alone banaba dose; animal studies used extract doses in the tens-of-milligrams-per-kilogram range
Route
Oral, in capsule form in the human trial and by gavage in the cited animal studies
Frequency studied
Once daily in the human combination-product trial
Half-life
Not established in these sources
Timing
with a meal
With food
with food
OTC supplementSold in the US as an over-the-counter dietary supplement, often standardized to corosolic acid content; not FDA-approved as a drugThe single identified human RCT tested banaba leaf extract only as part of a multi-ingredient product, so effects cannot be isolated to banaba aloneBlood SugarCardiovascular
Key references
- A review of the efficacy and safety of banaba (Lagerstroemia speciosa L.) and corosolic acid (2012)
- Evaluation of a Nutraceutical Product with Probiotics, Vitamin D, Plus Banaba Leaf Extracts (Lagerstroemia speciosa) in Patients with Prediabetes: A Randomized, Multicenter Study (2021)
- Antioxidant effect of Lagerstroemia speciosa Pers (banaba) leaf extract in streptozotocin-induced diabetic mice (2011)
Studied ranges, not dosing advice. Not medical advice — talk to a clinician. doseroutine.com/library/banaba-leaf
Cite this page
Using this in an article, AI answer, or research note? Please attribute:
DoseRoutine. (2026). Banaba Leaf — Overview, Benefits & Side Effects. Retrieved from https://doseroutine.com/library/banaba-leaf
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